vue项目,h5图片放大后,支持手指缩放功能

html:

css:

#knowledge-base{
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  padding: px2rem(66) px2rem(60) 0;
  .knowledge-title{
    color: #303030;
    font-size: px2rem(53);
    line-height: px2rem(74);
  }
  .knowledge-path{
    margin-top: px2rem(26);
    font-size: px2rem(46);
    color: #A5A5A5;
    line-height: px2rem(65);
  }
  .knowledge-sub{
    line-height: px2rem(73);
    font-size: px2rem(52);
    color: #32B29D;;
    margin-top: px2rem(66);
  }
  .content{
    line-height: px2rem(70);
    font-size: px2rem(50);
    color: #404040;
    margin-top: px2rem(114);
    img{
      max-width: 100%;
    }

  }

  .company-logo {
    display: flex;
    justify-content: space-between;
    background: #ffffff;
    padding: 0 px2rem(66) 0;
    .logo-l {
      line-height: px2rem(288);
      font-size: px2rem(53);
      color: #303030;
    }
    .logo-r {
      position: relative;
      .img-logo {
        width: px2rem(212);
        height: px2rem(212);
        margin: px2rem(40) px2rem(80) 0 0;
      }
      .skip {
        position: absolute;
        top: px2rem(120);
        right: 0;
        width: px2rem(28);
        height: px2rem(56);
      }
    }
    .upload {
      opacity: 0;
      position: absolute;
    }
    &:active {
      background: #ededed;
    }
  }
}
.bgM{
  max-width: 100%;
  height: 100%;
  position: fixed;
  top: 0;left: 0;right: 0;bottom: 0;
  z-index: 1000;
  background-color: rgba(0,0,0,0.95);
  overflow: hidden;
}
.bgM img{
  max-width: 100%;
  max-height: 95%;
  position: fixed;
  top: 0;left: 0;right: 0;bottom: 0;
  z-index: 1001;
  margin: auto;
}
/*弹框样式*/
.imgzoom_pack{
  width:100%;
  height:100%;
  position:fixed;
  left:0;
  top:0;
  background:rgba(0,0,0,0.95);
  display:none;
}
.imgzoom_pack .imgzoom_x{
  color:#000;
  height:px2rem(90);
  width:px2rem(90);
  line-height:px2rem(90);
  background: #ffffff;
  text-align:center;
  position:absolute;
  right:px2rem(30);
  top:px2rem(30);
  border-radius: 50%;
  z-index:10;
  cursor:pointer;
}
.imgzoom_pack .imgzoom_img{
  width:100%;
  height:100%;
  position:absolute;
  left:0;
  top:0;
  overflow:hidden;
}
.imgzoom_pack .imgzoom_img img{
  width:100%;
  position:absolute;
  top:50%;
}

js:

scale.js:

(function(window, undefined){
	var document = window.document,
		support = {
			transform3d: ("WebKitCSSMatrix" in window && "m11" in new WebKitCSSMatrix()),
			touch: ("ontouchstart" in window)
		};
		
	function getTranslate(x, y){
		var distX = x, distY = y;
		return support.transform3d ? "translate3d("+ distX +"px, "+ distY +"px, 0)" : "translate("+ distX +"px, "+ distY +"px)";
	}

	function getPage(event, page) {
		return support.touch ? event.changedTouches[0][page] : event[page];
	}

	var ImagesZoom = function(){};

	ImagesZoom.prototype = {
		// 给初始化数据
		init: function(param){
			var self   = this,
				params = param || {};
			var imgList   = document.querySelectorAll(params.elem + " img"),
				zoomMask  = document.querySelector(".imgzoom_pack"),
				zoomImg   = document.querySelector(".imgzoom_pack .imgzoom_img img"),
				zoomClose = document.querySelector(".imgzoom_pack .imgzoom_x"),
				imgSrc    = "";
			console.log(imgList,'imgList...');
			self.buffMove   = 3; //缓冲系数
			self.buffScale  = 2; //放大系数
			self.finger = false; //触摸手指的状态 false:单手指 true:多手指
			
			self._destroy();
			
			zoomMask.addEventListener("click", function(){
				this.style.cssText = "display:none";
				zoomImg.src = "";
				zoomImg.style.cssText = "";
				//
				self._destroy();
				//
				document.removeEventListener("touchmove", self.eventStop, false);
			}, false);
			
			zoomClose.addEventListener("click", function(){
				zoomMask.style.cssText = "display:none";
				zoomImg.src = "";
				zoomImg.style.cssText = "";

				self._destroy();

				document.removeEventListener("touchmove", self.eventStop, false);
			}, false);

			for(var len=imgList.length,i=0; i=2){
				self._zoom(e);
			}
		},
		_touchend: function(e){
			var self = this;

			self._changeData(); //重新计算数据
			if(self.finger){
				self.distX = -self.imgNewX;
				self.distY = -self.imgNewY;
			}

			if( self.distX>0 ){
				self.newX = 0;
			}else if( self.distX<=0 && self.distX>=-self.width ){
				self.newX = self.distX;
				self.newY = self.distY;
			}else if( self.distX<-self.width ){
				self.newX = -self.width;
			}
			self.reset();
		},
		_move: function(e){
			var self = this,
				pageX = getPage(e, "pageX"), //获取移动坐标
				pageY = getPage(e, "pageY");

			// 禁止默认事件
			// e.preventDefault();
			// e.stopPropagation();

			// 获得移动距离
			self.distX = (pageX - self.basePageX) + self.newX;
			self.distY = (pageY - self.basePageY) + self.newY;

			if(self.distX > 0){
				self.moveX = Math.round(self.distX/self.buffMove);
			}else if( self.distX<=0 && self.distX>=-self.width ){
				self.moveX = self.distX;
			}else if(self.distX < -self.width ){
				self.moveX = -self.width+Math.round((self.distX+self.width)/self.buffMove);
			}
			self.movePos();
			self.finger = false;
		},
		// 图片缩放
		_zoom: function(e){
			var self = this;
			// e.preventDefault();
			// e.stopPropagation();

			var nowFingerDist = self.getTouchDist(e).dist, //获得当前长度
				ratio 		  = nowFingerDist / self.startFingerDist, //计算缩放比
				imgWidth  	  = Math.round(self.mapX * ratio), //计算图片宽度
				imgHeight 	  = Math.round(self.mapY * ratio); //计算图片高度

			// 计算图片新的坐标
			self.imgNewX = Math.round(self.startFingerX * ratio - self.startFingerX - self.newX * ratio);
			self.imgNewY = Math.round((self.startFingerY * ratio - self.startFingerY)/2 - self.newY * ratio);

			if(imgWidth >= self.imgBaseWidth){
				self.element.style.width = imgWidth + "px";
				self.refresh(-self.imgNewX, -self.imgNewY, "0s", "ease");
				self.finger = true;	
			}else{
				if(imgWidth < self.imgBaseWidth){
					self.element.style.width = self.imgBaseWidth + "px";
				}
			}

			self.finger = true;
		},
		// 移动坐标
		movePos: function(){
			var self = this;

			if(self.height<0){
				if(self.element.offsetWidth == self.imgBaseWidth){
					self.moveY = Math.round(self.distY/self.buffMove);
				}else{
					var moveTop = Math.round((self.element.offsetHeight-self.imgBaseHeight)/2);
					self.moveY = -moveTop + Math.round((self.distY + moveTop)/self.buffMove);
				}
			}else{
				var a = Math.round((self.wrapY - self.imgBaseHeight)/2),
					b = self.element.offsetHeight - self.wrapY + Math.round(self.wrapY - self.imgBaseHeight)/2;

				if(self.distY >= -a){
					self.moveY = Math.round((self.distY + a)/self.buffMove) - a;
				}else if(self.distY <= -b){
					self.moveY = Math.round((self.distY + b)/self.buffMove) - b;
				}else{
					self.moveY = self.distY;
				}
			}
			self.refresh(self.moveX, self.moveY, "0s", "ease");
		},
		// 重置数据
		reset: function(){
			var self = this,
				hideTime = ".2s";
			if(self.height<0){
				self.newY = -Math.round(self.element.offsetHeight - self.imgBaseHeight)/2;
			}else{
				var a = Math.round((self.wrapY - self.imgBaseHeight)/2),
					b = self.element.offsetHeight - self.wrapY + Math.round(self.wrapY - self.imgBaseHeight)/2;

				if(self.distY >= -a){
					self.newY = -a;
				}else if(self.distY <= -b){
					self.newY = -b;
				}else{
					self.newY = self.distY;
				}
			}
			self.refresh(self.newX, self.newY, hideTime, "ease-in-out");
		},
		// 执行图片移动
		refresh: function(x, y, timer, type){
			this.element.style.webkitTransitionProperty = "-webkit-transform";
			this.element.style.webkitTransitionDuration = timer;
			this.element.style.webkitTransitionTimingFunction = type;
			this.element.style.webkitTransform = getTranslate(x, y);
		},
		// 获取多点触控
		getTouchDist: function(e){
			var x1 = 0,
				y1 = 0,
				x2 = 0,
				y2 = 0,
				x3 = 0,
				y3 = 0,
				result = {};

			x1 = e.touches[0].pageX;
			x2 = e.touches[1].pageX;
			y1 = e.touches[0].pageY - document.body.scrollTop;
			y2 = e.touches[1].pageY - document.body.scrollTop;

			if(!x1 || !x2) return;

			if(x1<=x2){
				x3 = (x2-x1)/2+x1;
			}else{
				x3 = (x1-x2)/2+x2;
			}
			if(y1<=y2){
				y3 = (y2-y1)/2+y1;
			}else{
				y3 = (y1-y2)/2+y2;
			}

			result = {
				dist: Math.round(Math.sqrt(Math.pow(x1-x2,2)+Math.pow(y1-y2,2))),
				x: Math.round(x3),
				y: Math.round(y3)
			};
			return result;
		},
		eventStop: function(e){
			e.preventDefault();
			e.stopPropagation();
		}
	};

	window.ImagesZoom = new ImagesZoom();
})(window);

引用的js库地址:

https://github.com/appue/touchzoom 

 

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