项目中常用的JS方法整理

验证是否为图片格式


代码如下:


 function IsImgType(src) {
     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)$/i;
     var Filter = /(?:bmp|cis-cod|gif|ief|jpeg|jpeg|jpeg|pipeg|png|svg+xml|tiff|x-cmu-raster|x-cmx|x-icon|x-portable-anymap|x-portable-bitmap|x-portable-graymap|x-portable-pixmap|x-rgb|x-xbitmap|x-xpixmap|x-xwindowdump)$/i;
     return rFilter.test(src) || Filter.test(src);
 }



验证是否为颜色


代码如下:


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:


代码如下:


 function zero_fill_hex(num, digits) {
     var s = num.toString(16);
     while (s.length < digits) {
         s = "0" + s;
     }
     return s;
 }
 function rgb2hex(rgb) {
     if (rgb.charAt(0) == '#') {
         return rgb;
     }
     var ds = rgb.split(/D+/);
     var decimal = Number(ds[1]) * 65536 + Number(ds[2]) * 256 + Number(ds[3]);
     return "#" + zero_fill_hex(decimal, 6);
 }



验证是否为Email地址：


代码如下:


 function testEmail (value, target) {
     value = value.trim();
     if (!/^w+([.-]?w+)*@w+([.-]?w+)*(.w{2,3})+$/.test(value)) {
         target.val("");
         alert("Please fill in the correct E-mail address!");
     }
 }



将图片src转化为data 64:


代码如下:


function createImgData(img) {
    var image = new Image();
    image.src = img.src || img;
    var tmpCanvas = $("<canvas></canvas>")[0];
    var tmpCtx = tmpCanvas.getContext("2d");
    if (tmpCanvas) {
        tmpCanvas.width = image.width;
        tmpCanvas.height = image.height;
        tmpCtx.drawImage(image, 0, 0);
        return tmpCanvas.toDataURL();
    }
}



上面这些就是本人最近项目中所用到的常用的js方法了，整理出来，希望小伙伴们能够喜欢。


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