整理一些最近项目中用到的一些JS方法

验证是否为图片格式

1 function IsImgType(src) {

2     var rFilter = /^(?:image\/bmp|image\/cis\-cod|image\/gif|image\/ief|image\/jpeg|image\/jpeg|image\/jpeg|image\/pipeg|image\/png|image\/svg\+xml|image\/tiff|image\/x\-cmu\-raster|image\/x\-cmx|image\/x\-icon|image\/x\-portable\-anymap|image\/x\-portable\-bitmap|image\/x\-portable\-graymap|image\/x\-portable\-pixmap|image\/x\-rgb|image\/x\-xbitmap|image\/x\-xpixmap|image\/x\-xwindowdump)$/i;

3     var Filter = /(?:bmp|cis\-cod|gif|ief|jpeg|jpeg|jpeg|pipeg|png|svg\+xml|tiff|x\-cmu\-raster|x\-cmx|x\-icon|x\-portable\-anymap|x\-portable\-bitmap|x\-portable\-graymap|x\-portable\-pixmap|x\-rgb|x\-xbitmap|x\-xpixmap|x\-xwindowdump)$/i;

4     return rFilter.test(src) || Filter.test(src);

5 }

 

验证是否为颜色

function detectColor(value) {

    var pattern = /^#[0-9a-fA-F]{6}$/; //#XXXXXX

    var result;

    var rgbRegex = /(^rgb\((\d+),\s*(\d+),\s*(\d+)\)$)|(^rgba\((\d+),\s*(\d+),\s*(\d+)(,\s*\d+\.\d+)*\)$)/;

    if (pattern.test(value)) {

        result = value;

    } else if (rgbRegex.test(value)) { //rgba(0, 0, 0, 0)

        result = value;

    }

    return result;

}

将RGB转化为HEX:

 1 function zero_fill_hex(num, digits) {

 2     var s = num.toString(16);

 3     while (s.length < digits) {

 4         s = "0" + s;

 5     }

 6     return s;

 7 }

 8 

 9 function rgb2hex(rgb) {

10     if (rgb.charAt(0) == '#') {

11         return rgb;

12     }

13     var ds = rgb.split(/\D+/);

14     var decimal = Number(ds[1]) * 65536 + Number(ds[2]) * 256 + Number(ds[3]);

15     return "#" + zero_fill_hex(decimal, 6);

16 }

验证是否为Email地址：

1 function testEmail (value, target) {

2     value = value.trim();

3     if (!/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(value)) {

4         target.val("");

5         alert("Please fill in the correct E-mail address!");

6     }

7 }

将图片src转化为data 64:

 1 function createImgData(img) {

 2     var image = new Image();

 3     image.src = img.src || img;

 4     var tmpCanvas = $("<canvas></canvas>")[0];

 5     var tmpCtx = tmpCanvas.getContext("2d");

 6     if (tmpCanvas) {

 7         tmpCanvas.width = image.width;

 8         tmpCanvas.height = image.height;

 9         tmpCtx.drawImage(image, 0, 0);

10         return tmpCanvas.toDataURL();

11     }

12 }