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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 =http://www.mamicode.com/ 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 = http://www.mamicode.com/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 }

 

整理一些最近项目中用到的一些JS方法