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

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

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:

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：

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:

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();
    }
}