專案中常用的JS方法整理_javascript技巧

驗證是否為圖片格式

複製程式碼 程式碼如下:

 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);
 }

驗證是否為顏色

複製程式碼 程式碼如下:

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;
}

將RGB轉換為HEX:

複製程式碼 程式碼如下:

 function zero_fill_hex(num, digits) {
     var s = num.toString(16);
     while (s.length          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);
 }

驗證是否為Email位址：

複製程式碼 程式碼如下:

 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!");
     }
 }

將圖片src轉換為data 64:

複製程式碼 程式碼如下:

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

上面這些就是本人最近專案中所用到的常用的js方法了，整理出來，希望小夥伴們能夠喜歡。