昵称：马云云
技能：前端 + 后端 + 小程序 + webapp
语言：html5、php、mysql
脚本：javascript
框架：vue.js、smarty、thinkphp、MUI、WeUI、Bootstrap
html元素转canvas并一键生成png图片(支持img图片元素)html2canvas、canvas2image
在做项目的时候
遇到一个需要把页面上的一些元素一键转成图片并且可以下载，在这里就做一个简单的介绍，希望可以帮到大家！！
需要引入html2canvas.js、canvas2image.js、base64.js 点击获取资源
需要在header中引入
html2canvas.js、canvas2image.js、base64.js 库文件
html2image思路 需要获取的元素的节点-->点击捕获按扭-->获取节点内元素信息-->利用库文件html2canvas进行绘制-->绘制成功后点击下载按钮-->利用库文件canvas2image转换为img，使用base64对图片编码-->下载图片
html代码：
html元素转canvas并一键生成png图片(支持img图片元素)
注意：html2canvas 只能在服务器中抓取img
==>
图片预览区
/*
html2canvas 0.4.1
Copyright (c) 2013 Niklas von Hertzen
Released under MIT License
*/
(function(t,e,n){"use strict";function r(t,e,n){var r,a=t.runtimeStyle&&t.runtimeStyle[e],o=t.style;return!/^-?[0-9]+\.?[0-9]*(?:px)?$/i.test(n)&&/^-?\d/.test(n)&&(r=o.left,a&&(t.runtimeStyle.left=t.currentStyle.left),o.left="fontSize"===e?"1em":n||0,n=o.pixelLeft+"px",o.left=r,a&&(t.runtimeStyle.left=a)),/^(thin|medium|thick)$/i.test(n)?n:Math.round(parseFloat(n))+"px"}function a(t){return parseInt(t,10)}function o(t,e,a,o){if(t=(t||"").split(","),t=t[o||0]||t[0]||"auto",t=u.Util.trimText(t).split(" "),"backgroundSize"!==a||t[0]&&!t[0].match(/cover|contain|auto/)){if(t[0]=-1===t[0].indexOf("%")?r(e,a+"X",t[0]):t[0],t[1]===n){if("backgroundSize"===a)return t[1]="auto",t;t[1]=t[0]}t[1]=-1===t[1].indexOf("%")?r(e,a+"Y",t[1]):t[1]}else;return t}function i(t,e,n,r,a,o){var i,l,s,c,d=u.Util.getCSS(e,t,a);if(1===d.length&&(c=d[0],d=[],d[0]=c,d[1]=c),-1!==(""+d[0]).indexOf("%"))s=parseFloat(d[0])/100,l=n.width*s,"backgroundSize"!==t&&(l-=(o||r).width*s);else if("backgroundSize"===t)if("auto"===d[0])l=r.width;else if(/contain|cover/.test(d[0])){var h=u.Util.resizeBounds(r.width,r.height,n.width,n.height,d[0]);l=h.width,i=h.height}else l=parseInt(d[0],10);else l=parseInt(d[0],10);return"auto"===d[1]?i=l/r.width*r.height:-1!==(""+d[1]).indexOf("%")?(s=parseFloat(d[1])/100,i=n.height*s,"backgroundSize"!==t&&(i-=(o||r).height*s)):i=parseInt(d[1],10),[l,i]}function l(t,e){var n=[];return{storage:n,width:t,height:e,clip:function(){n.push({type:"function",name:"clip",arguments:arguments})},translate:function(){n.push({type:"function",name:"translate",arguments:arguments})},fill:function(){n.push({type:"function",name:"fill",arguments:arguments})},save:function(){n.push({type:"function",name:"save",arguments:arguments})},restore:function(){n.push({type:"function",name:"restore",arguments:arguments})},fillRect:function(){n.push({type:"function",name:"fillRect",arguments:arguments})},createPattern:function(){n.push({type:"function",name:"createPattern",arguments:arguments})},drawShape:function(){var t=[];return n.push({type:"function",name:"drawShape",arguments:t}),{moveTo:function(){t.push({name:"moveTo",arguments:arguments})},lineTo:function(){t.push({name:"lineTo",arguments:arguments})},arcTo:function(){t.push({name:"arcTo",arguments:arguments})},bezierCurveTo:function(){t.push({name:"bezierCurveTo",arguments:arguments})},quadraticCurveTo:function(){t.push({name:"quadraticCurveTo",arguments:arguments})}}},drawImage:function(){n.push({type:"function",name:"drawImage",arguments:arguments})},fillText:function(){n.push({type:"function",name:"fillText",arguments:arguments})},setVariable:function(t,e){return n.push({type:"variable",name:t,arguments:e}),e}}}function s(t){return{zindex:t,children:[]}}var c,d,u={};u.Util={},u.Util.log=function(e){u.logging&&t.console&&t.console.log&&t.console.log(e)},u.Util.trimText=function(t){return function(e){return t?t.apply(e):((e||"")+"").replace(/^\s+|\s+$/g,"")}}(String.prototype.trim),u.Util.asFloat=function(t){return parseFloat(t)},function(){var t=/((rgba|rgb)\([^\)]+\)(\s-?\d+px){0,})/g,e=/(-?\d+px)|(#.+)|(rgb\(.+\))|(rgba\(.+\))/g;u.Util.parseTextShadows=function(n){if(!n||"none"===n)return[];for(var r=n.match(t),a=[],o=0;r&&r.length>o;o++){var i=r[o].match(e);a.push({color:i[0],offsetX:i[1]?i[1].replace("px",""):0,offsetY:i[2]?i[2].replace("px",""):0,blur:i[3]?i[3].replace("px",""):0})}return a}}(),u.Util.parseBackgroundImage=function(t){var e,n,r,a,o,i,l,s,c=" \r\n ",d=[],u=0,h=0,f=function(){e&&('"'===n.substr(0,1)&&(n=n.substr(1,n.length-2)),n&&s.push(n),"-"===e.substr(0,1)&&(a=e.indexOf("-",1)+1)>0&&(r=e.substr(0,a),e=e.substr(a)),d.push({prefix:r,method:e.toLowerCase(),value:o,args:s})),s=[],e=r=n=o=""};f();for(var p=0,g=t.length;g>p;p++)if(i=t[p],!(0===u&&c.indexOf(i)>-1)){switch(i){case'"':l?l===i&&(l=null):l=i;break;case"(":if(l)break;if(0===u){u=1,o+=i;continue}h++;break;case")":if(l)break;if(1===u){if(0===h){u=0,o+=i,f();continue}h--}break;case",":if(l)break;if(0===u){f();continue}if(1===u&&0===h&&!e.match(/^url$/i)){s.push(n),n="",o+=i;continue}}o+=i,0===u?e+=i:n+=i}return f(),d},u.Util.Bounds=function(t){var e,n={};return t.getBoundingClientRect&&(e=t.getBoundingClientRect(),n.top=e.top,n.bottom=e.bottom||e.top+e.height,n.left=e.left,n.width=t.offsetWidth,n.height=t.offsetHeight),n},u.Util.OffsetBounds=function(t){var e=t.offsetParent?u.Util.OffsetBounds(t.offsetParent):{top:0,left:0};return{top:t.offsetTop+e.top,bottom:t.offsetTop+t.offsetHeight+e.top,left:t.offsetLeft+e.left,width:t.offsetWidth,height:t.offsetHeight}},u.Util.getCSS=function(t,n,r){c!==t&&(d=e.defaultView.getComputedStyle(t,null));var i=d[n];if(/^background(Size|Position)$/.test(n))return o(i,t,n,r);if(/border(Top|Bottom)(Left|Right)Radius/.test(n)){var l=i.split(" ");return 1>=l.length&&(l[1]=l[0]),l.map(a)}return i},u.Util.resizeBounds=function(t,e,n,r,a){var o,i,l=n/r,s=t/e;return a&&"auto"!==a?s>l^"contain"===a?(i=r,o=r*s):(o=n,i=n/s):(o=n,i=r),{width:o,height:i}},u.Util.BackgroundPosition=function(t,e,n,r,a){var o=i("backgroundPosition",t,e,n,r,a);return{left:o[0],top:o[1]}},u.Util.BackgroundSize=function(t,e,n,r){var a=i("backgroundSize",t,e,n,r);return{width:a[0],height:a[1]}},u.Util.Extend=function(t,e){for(var n in t)t.hasOwnProperty(n)&&(e[n]=t[n]);return e},u.Util.Children=function(t){var e;try{e=t.nodeName&&"IFRAME"===t.nodeName.toUpperCase()?t.contentDocument||t.contentWindow.document:function(t){var e=[];return null!==t&&function(t,e){var r=t.length,a=0;if("number"==typeof e.length)for(var o=e.length;o>a;a++)t[r++]=e[a];else for(;e[a]!==n;)t[r++]=e[a++];return t.length=r,t}(e,t),e}(t.childNodes)}catch(r){u.Util.log("html2canvas.Util.Children failed with exception: "+r.message),e=[]}return e},u.Util.isTransparent=function(t){return"transparent"===t||"rgba(0, 0, 0, 0)"===t},u.Util.Font=function(){var t={};return function(e,r,a){if(t[e+"-"+r]!==n)return t[e+"-"+r];var o,i,l,s=a.createElement("div"),c=a.createElement("img"),d=a.createElement("span"),u="Hidden Text";return s.style.visibility="hidden",s.style.fontFamily=e,s.style.fontSize=r,s.style.margin=0,s.style.padding=0,a.body.appendChild(s),c.src="data:image/gif;base64,R0lGODlhAQABAIABAP///wAAACwAAAAAAQABAAACAkQBADs=",c.width=1,c.height=1,c.style.margin=0,c.style.padding=0,c.style.verticalAlign="baseline",d.style.fontFamily=e,d.style.fontSize=r,d.style.margin=0,d.style.padding=0,d.appendChild(a.createTextNode(u)),s.appendChild(d),s.appendChild(c),o=c.offsetTop-d.offsetTop+1,s.removeChild(d),s.appendChild(a.createTextNode(u)),s.style.lineHeight="normal",c.style.verticalAlign="super",i=c.offsetTop-s.offsetTop+1,l={baseline:o,lineWidth:1,middle:i},t[e+"-"+r]=l,a.body.removeChild(s),l}}(),function(){function t(t){return function(e){try{t.addColorStop(e.stop,e.color)}catch(r){n.log(["failed to add color stop: ",r,"; tried to add: ",e])}}}var n=u.Util,r={};u.Generate=r;var a=[/^(-webkit-linear-gradient)\(([a-z\s]+)([\w\d\.\s,%\(\)]+)\)$/,/^(-o-linear-gradient)\(([a-z\s]+)([\w\d\.\s,%\(\)]+)\)$/,/^(-webkit-gradient)\((linear|radial),\s((?:\d{1,3}%?)\s(?:\d{1,3}%?),\s(?:\d{1,3}%?)\s(?:\d{1,3}%?))([\w\d\.\s,%\(\)\-]+)\)$/,/^(-moz-linear-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?))([\w\d\.\s,%\(\)]+)\)$/,/^(-webkit-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s([a-z\-]+)([\w\d\.\s,%\(\)]+)\)$/,/^(-moz-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s?([a-z\-]*)([\w\d\.\s,%\(\)]+)\)$/,/^(-o-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s([a-z\-]+)([\w\d\.\s,%\(\)]+)\)$/];r.parseGradient=function(t,e){var 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a,o=Z(t,e),i=ne(t,o),l=te(t,e,i,o),s=l.borders,c=l.ctx,d=ee(s,i,l.clip),u=P(t,i,s),h=fe.test(t.nodeName)?"#efefef":ge(t,"backgroundColor");switch(F(c,u.clip),c.save(),c.clip(),d.height>0&&d.width>0&&!r?(X(c,i,h),Y(t,d,c)):r&&(l.backgroundColor=h),c.restore(),u.borders.forEach(function(t){V(c,t.args,t.color)}),n||H(t,l),t.nodeName){case"IMG":(a=M(t.getAttribute("src")))?I(c,t,a,i,s):ue.log("html2canvas: Error loading ![]()
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display: none !important; }'+"."+me+'-after:after { content: "" !important; display: none !important; }',pe.appendChild(ye),r=r||{};var be=function(t){return function(e,n,r,a){var o=r*t,i=a*t,l=e+r,s=n+a;return{topLeft:z({x:e,y:s},{x:e,y:s-i},{x:l-o,y:n},{x:l,y:n}),topRight:z({x:e,y:n},{x:e+o,y:n},{x:l,y:s-i},{x:l,y:s}),bottomRight:z({x:l,y:n},{x:l,y:n+i},{x:e+o,y:s},{x:e,y:s}),bottomLeft:z({x:l,y:s},{x:l-o,y:s},{x:e,y:n+i},{x:e,y:n})}}}(4*((Math.sqrt(2)-1)/3)),we=/(matrix)\((.+)\)/;return le()},u.Preload=function(r){function a(t){M.href=t,M.href=M.href;var e=M.protocol+M.host;return e===g}function o(){x.log("html2canvas: start: images: "+w.numLoaded+" / "+w.numTotal+" (failed: "+w.numFailed+")"),!w.firstRun&&w.numLoaded>=w.numTotal&&(x.log("Finished loading images: # "+w.numTotal+" (failed: "+w.numFailed+")"),"function"==typeof r.complete&&r.complete(w))}function i(e,a,i){var l,s,c=r.proxy;M.href=e,e=M.href,l="html2canvas_"+v++,i.callbackname=l,c+=c.indexOf("?")>-1?"&":"?",c+="url="+encodeURIComponent(e)+"&callback="+l,s=C.createElement("script"),t[l]=function(e){"error:"===e.substring(0,6)?(i.succeeded=!1,w.numLoaded++,w.numFailed++,o()):(p(a,i),a.src=e),t[l]=n;try{delete t[l]}catch(r){}s.parentNode.removeChild(s),s=null,delete i.script,delete i.callbackname},s.setAttribute("type","text/javascript"),s.setAttribute("src",c),i.script=s,t.document.body.appendChild(s)}function l(e,n){var r=t.getComputedStyle(e,n),a=r.content;"url"===a.substr(0,3)&&m.loadImage(u.Util.parseBackgroundImage(a)[0].args[0]),h(r.backgroundImage,e)}function s(t){l(t,":before"),l(t,":after")}function c(t,e){var r=u.Generate.Gradient(t,e);r!==n&&(w[t]={img:r,succeeded:!0},w.numTotal++,w.numLoaded++,o())}function d(t){return t&&t.method&&t.args&&t.args.length>0}function h(t,e){var r;u.Util.parseBackgroundImage(t).filter(d).forEach(function(t){"url"===t.method?m.loadImage(t.args[0]):t.method.match(/\-?gradient$/)&&(r===n&&(r=u.Util.Bounds(e)),c(t.value,r))})}function f(t){var e=!1;try{x.Children(t).forEach(f)}catch(r){}try{e=t.nodeType}catch(a){e=!1,x.log("html2canvas: failed to access some element's nodeType - Exception: "+a.message)}if(1===e||e===n){s(t);try{h(x.getCSS(t,"backgroundImage"),t)}catch(r){x.log("html2canvas: failed to get background-image - Exception: "+r.message)}h(t)}}function p(e,a){e.οnlοad=function(){a.timer!==n&&t.clearTimeout(a.timer),w.numLoaded++,a.succeeded=!0,e.οnerrοr=e.οnlοad=null,o()},e.οnerrοr=function(){if("anonymous"===e.crossOrigin&&(t.clearTimeout(a.timer),r.proxy)){var l=e.src;return e=new Image,a.img=e,e.src=l,i(e.src,e,a),n}w.numLoaded++,w.numFailed++,a.succeeded=!1,e.οnerrοr=e.οnlοad=null,o()}}var g,m,y,b,w={numLoaded:0,numFailed:0,numTotal:0,cleanupDone:!1},x=u.Util,v=0,k=r.elements[0]||e.body,C=k.ownerDocument,T=k.getElementsByTagName("img"),S=T.length,M=C.createElement("a"),R=function(t){return t.crossOrigin!==n}(new Image);for(M.href=t.location.href,g=M.protocol+M.host,m={loadImage:function(t){var e,o;t&&w[t]===n&&(e=new Image,t.match(/data:image\/.*;base64,/i)?(e.src=t.replace(/url\(['"]{0,}|['"]{0,}\)$/gi,""),o=w[t]={img:e},w.numTotal++,p(e,o)):a(t)||r.allowTaint===!0?(o=w[t]={img:e},w.numTotal++,p(e,o),e.src=t):R&&!r.allowTaint&&r.useCORS?(e.crossOrigin="anonymous",o=w[t]={img:e},w.numTotal++,p(e,o),e.src=t):r.proxy&&(o=w[t]={img:e},w.numTotal++,i(t,e,o)))},cleanupDOM:function(a){var i,l;if(!w.cleanupDone){a&&"string"==typeof a?x.log("html2canvas: Cleanup because: "+a):x.log("html2canvas: Cleanup after timeout: "+r.timeout+" ms.");for(l in w)if(w.hasOwnProperty(l)&&(i=w[l],"object"==typeof i&&i.callbackname&&i.succeeded===n)){t[i.callbackname]=n;try{delete t[i.callbackname]}catch(s){}i.script&&i.script.parentNode&&(i.script.setAttribute("src","about:blank"),i.script.parentNode.removeChild(i.script)),w.numLoaded++,w.numFailed++,x.log("html2canvas: Cleaned up failed img: '"+l+"' Steps: "+w.numLoaded+" / "+w.numTotal)}t.stop!==n?t.stop():e.execCommand!==n&&e.execCommand("Stop",!1),e.close!==n&&e.close(),w.cleanupDone=!0,a&&"string"==typeof a||o()}},renderingDone:function(){b&&t.clearTimeout(b)}},r.timeout>0&&(b=t.setTimeout(m.cleanupDOM,r.timeout)),x.log("html2canvas: Preload starts: finding background-images"),w.firstRun=!0,f(k),x.log("html2canvas: Preload: Finding images"),y=0;S>y;y+=1)m.loadImage(T[y].getAttribute("src"));return w.firstRun=!1,x.log("html2canvas: Preload: Done."),w.numTotal===w.numLoaded&&o(),m},u.Renderer=function(t,r){function a(t){function e(t){Object.keys(t).sort().forEach(function(n){var r=[],o=[],i=[],l=[];
t[n].forEach(function(t){t.node.zIndex.isPositioned||1>t.node.zIndex.opacity?i.push(t):t.node.zIndex.isFloated?o.push(t):r.push(t)}),function s(t){t.forEach(function(t){l.push(t),t.children&&s(t.children)})}(r.concat(o,i)),l.forEach(function(t){t.context?e(t.context):a.push(t.node)})})}var r,a=[];return r=function(t){function e(t,r,a){var o="auto"===r.zIndex.zindex?0:Number(r.zIndex.zindex),i=t,l=r.zIndex.isPositioned,s=r.zIndex.isFloated,c={node:r},d=a;r.zIndex.ownStacking?(i=c.context={"!":[{node:r,children:[]}]},d=n):(l||s)&&(d=c.children=[]),0===o&&a?a.push(c):(t[o]||(t[o]=[]),t[o].push(c)),r.zIndex.children.forEach(function(t){e(i,t,d)})}var r={};return e(r,t),r}(t),e(r),a}function o(t){var e;if("string"==typeof r.renderer&&u.Renderer[t]!==n)e=u.Renderer[t](r);else{if("function"!=typeof t)throw Error("Unknown renderer");e=t(r)}if("function"!=typeof e)throw Error("Invalid renderer defined");return e}return o(r.renderer)(t,r,e,a(t.stack),u)},u.Util.Support=function(t,e){function r(){var t=new Image,r=e.createElement("canvas"),a=r.getContext===n?!1:r.getContext("2d");if(a===!1)return!1;r.width=r.height=10,t.src=["data:image/svg+xml,",""].join("");try{a.drawImage(t,0,0),r.toDataURL()}catch(o){return!1}return u.Util.log("html2canvas: Parse: SVG powered rendering available"),!0}function a(){var t,n,r,a,o=!1;return e.createRange&&(t=e.createRange(),t.getBoundingClientRect&&(n=e.createElement("boundtest"),n.style.height="123px",n.style.display="block",e.body.appendChild(n),t.selectNode(n),r=t.getBoundingClientRect(),a=r.height,123===a&&(o=!0),e.body.removeChild(n))),o}return{rangeBounds:a(),svgRendering:t.svgRendering&&r()}},t.html2canvas=function(e,n){e=e.length?e:[e];var r,a,o={logging:!1,elements:e,background:"#fff",proxy:null,timeout:0,useCORS:!1,allowTaint:!1,svgRendering:!1,ignoreElements:"IFRAME|OBJECT|PARAM",useOverflow:!0,letterRendering:!1,chinese:!1,width:null,height:null,taintTest:!0,renderer:"Canvas"};return o=u.Util.Extend(n,o),u.logging=o.logging,o.complete=function(t){("function"!=typeof o.onpreloaded||o.onpreloaded(t)!==!1)&&(r=u.Parse(t,o),("function"!=typeof o.onparsed||o.onparsed(r)!==!1)&&(a=u.Renderer(r,o),"function"==typeof o.onrendered&&o.onrendered(a)))},t.setTimeout(function(){u.Preload(o)},0),{render:function(t,e){return u.Renderer(t,u.Util.Extend(e,o))},parse:function(t,e){return u.Parse(t,u.Util.Extend(e,o))},preload:function(t){return u.Preload(u.Util.Extend(t,o))},log:u.Util.log}},t.html2canvas.log=u.Util.log,t.html2canvas.Renderer={Canvas:n},u.Renderer.Canvas=function(t){function r(t,e){t.beginPath(),e.forEach(function(e){t[e.name].apply(t,e.arguments)}),t.closePath()}function a(t){if(-1===l.indexOf(t.arguments[0].src)){c.drawImage(t.arguments[0],0,0);try{c.getImageData(0,0,1,1)}catch(e){return s=i.createElement("canvas"),c=s.getContext("2d"),!1}l.push(t.arguments[0].src)}return!0}function o(e,n){switch(n.type){case"variable":e[n.name]=n.arguments;break;case"function":switch(n.name){case"createPattern":if(n.arguments[0].width>0&&n.arguments[0].height>0)try{e.fillStyle=e.createPattern(n.arguments[0],"repeat")}catch(o){d.log("html2canvas: Renderer: Error creating pattern",o.message)}break;case"drawShape":r(e,n.arguments);break;case"drawImage":n.arguments[8]>0&&n.arguments[7]>0&&(!t.taintTest||t.taintTest&&a(n))&&e.drawImage.apply(e,n.arguments);break;default:e[n.name].apply(e,n.arguments)}}}t=t||{};var i=e,l=[],s=e.createElement("canvas"),c=s.getContext("2d"),d=u.Util,h=t.canvas||i.createElement("canvas");return function(t,e,r,a,i){var l,s,c,u=h.getContext("2d"),f=t.stack;return h.width=h.style.width=e.width||f.ctx.width,h.height=h.style.height=e.height||f.ctx.height,c=u.fillStyle,u.fillStyle=d.isTransparent(f.backgroundColor)&&e.background!==n?e.background:t.backgroundColor,u.fillRect(0,0,h.width,h.height),u.fillStyle=c,a.forEach(function(t){u.textBaseline="bottom",u.save(),t.transform.matrix&&(u.translate(t.transform.origin[0],t.transform.origin[1]),u.transform.apply(u,t.transform.matrix),u.translate(-t.transform.origin[0],-t.transform.origin[1])),t.clip&&(u.beginPath(),u.rect(t.clip.left,t.clip.top,t.clip.width,t.clip.height),u.clip()),t.ctx.storage&&t.ctx.storage.forEach(function(t){o(u,t)}),u.restore()}),d.log("html2canvas: Renderer: Canvas renderer done - returning canvas obj"),1===e.elements.length&&"object"==typeof e.elements[0]&&"BODY"!==e.elements[0].nodeName?(s=i.Util.Bounds(e.elements[0]),l=r.createElement("canvas"),l.width=Math.ceil(s.width),l.height=Math.ceil(s.height),u=l.getContext("2d"),u.drawImage(h,s.left,s.top,s.width,s.height,0,0,s.width,s.height),h=null,l):h}}})(window,document); /*
* Canvas2Image v0.1
* Copyright (c) 2008 Jacob Seidelin, [email protected]
* MIT License [http://www.opensource.org/licenses/mit-license.php]
*/
var Canvas2Image = (function() {
// check if we have canvas support
var bHasCanvas = false;
var oCanvas = document.createElement("canvas");
if (oCanvas.getContext("2d")) {
bHasCanvas = true;
}
// no canvas, bail out.
if (!bHasCanvas) {
return {
saveAsBMP : function(){},
saveAsPNG : function(){},
saveAsJPEG : function(){}
}
}
var bHasImageData = !!(oCanvas.getContext("2d").getImageData);
var bHasDataURL = !!(oCanvas.toDataURL);
var bHasBase64 = !!(window.btoa);
var strDownloadMime = "image/octet-stream";
// ok, we're good
var readCanvasData = function(oCanvas) {
var iWidth = parseInt(oCanvas.width);
var iHeight = parseInt(oCanvas.height);
return oCanvas.getContext("2d").getImageData(0,0,iWidth,iHeight);
}
// base64 encodes either a string or an array of charcodes
var encodeData = function(data) {
var strData = "";
if (typeof data == "string") {
strData = data;
} else {
var aData = data;
for (var i=0;i object containing the imagedata
var makeImageObject = function(strSource) {
var oImgElement = document.createElement("img");
oImgElement.src = strSource;
return oImgElement;
}
var scaleCanvas = function(oCanvas, iWidth, iHeight) {
if (iWidth && iHeight) {
var oSaveCanvas = document.createElement("canvas");
oSaveCanvas.width = iWidth;
oSaveCanvas.height = iHeight;
oSaveCanvas.style.width = iWidth+"px";
oSaveCanvas.style.height = iHeight+"px";
var oSaveCtx = oSaveCanvas.getContext("2d");
oSaveCtx.drawImage(oCanvas, 0, 0, oCanvas.width, oCanvas.height, 0, 0, iWidth, iHeight);
return oSaveCanvas;
}
return oCanvas;
}
return {
saveAsPNG : function(oCanvas, bReturnImg, iWidth, iHeight) {
if (!bHasDataURL) {
return false;
}
var oScaledCanvas = scaleCanvas(oCanvas, iWidth, iHeight);
var strData = oScaledCanvas.toDataURL("image/png");
if (bReturnImg) {
return makeImageObject(strData);
} else {
saveFile(strData.replace("image/png", strDownloadMime));
}
return true;
},
saveAsJPEG : function(oCanvas, bReturnImg, iWidth, iHeight) {
if (!bHasDataURL) {
return false;
}
var oScaledCanvas = scaleCanvas(oCanvas, iWidth, iHeight);
var strMime = "image/jpeg";
var strData = oScaledCanvas.toDataURL(strMime);
// check if browser actually supports jpeg by looking for the mime type in the data uri.
// if not, return false
if (strData.indexOf(strMime) != 5) {
return false;
}
if (bReturnImg) {
return makeImageObject(strData);
} else {
saveFile(strData.replace(strMime, strDownloadMime));
}
return true;
},
saveAsBMP : function(oCanvas, bReturnImg, iWidth, iHeight) {
if (!(bHasImageData && bHasBase64)) {
return false;
}
var oScaledCanvas = scaleCanvas(oCanvas, iWidth, iHeight);
var oData = readCanvasData(oScaledCanvas);
var strImgData = createBMP(oData);
if (bReturnImg) {
return makeImageObject(makeDataURI(strImgData, "image/bmp"));
} else {
saveFile(makeDataURI(strImgData, strDownloadMime));
}
return true;
}
};
})(); /* Copyright (C) 1999 Masanao Izumo
* Version: 1.0
* LastModified: Dec 25 1999
* This library is free. You can redistribute it and/or modify it.
*/
/*
* Interfaces:
* b64 = base64encode(data);
* data = base64decode(b64);
*/
(function() {
var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var base64DecodeChars = new Array(
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);
function base64encode(str) {
var out, i, len;
var c1, c2, c3;
len = str.length;
i = 0;
out = "";
while(i < len) {
c1 = str.charCodeAt(i++) & 0xff;
if(i == len)
{
out += base64EncodeChars.charAt(c1 >> 2);
out += base64EncodeChars.charAt((c1 & 0x3) << 4);
out += "==";
break;
}
c2 = str.charCodeAt(i++);
if(i == len)
{
out += base64EncodeChars.charAt(c1 >> 2);
out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
out += base64EncodeChars.charAt((c2 & 0xF) << 2);
out += "=";
break;
}
c3 = str.charCodeAt(i++);
out += base64EncodeChars.charAt(c1 >> 2);
out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));
out += base64EncodeChars.charAt(c3 & 0x3F);
}
return out;
}
function base64decode(str) {
var c1, c2, c3, c4;
var i, len, out;
len = str.length;
i = 0;
out = "";
while(i < len) {
/* c1 */
do {
c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
} while(i < len && c1 == -1);
if(c1 == -1)
break;
/* c2 */
do {
c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
} while(i < len && c2 == -1);
if(c2 == -1)
break;
out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));
/* c3 */
do {
c3 = str.charCodeAt(i++) & 0xff;
if(c3 == 61)
return out;
c3 = base64DecodeChars[c3];
} while(i < len && c3 == -1);
if(c3 == -1)
break;
out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));
/* c4 */
do {
c4 = str.charCodeAt(i++) & 0xff;
if(c4 == 61)
return out;
c4 = base64DecodeChars[c4];
} while(i < len && c4 == -1);
if(c4 == -1)
break;
out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
}
return out;
}
if (!window.btoa) window.btoa = base64encode;
if (!window.atob) window.atob = base64decode;
})(); 备注： html2canvas 只能在服务器中抓取img，
如果是在本地编辑文件在浏览器
上可以抓取除了img标签外的元素，
但是节点中的img是抓取不到的
必须将代码放在服务器中进行对img标签进行抓取