Organizing JS methods commonly used in projects_javascript skills

Verify whether it is an image format

Copy code The code is as follows:

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);
}

Verify if it is color

Copy code The code is as follows:

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;
}

Convert RGB to HEX:

Copy code The code is as follows:

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);
}

Verify whether it is an email address:

Copy code The code is as follows:

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!");
}
}

Convert image src to data 64:

Copy code The code is as follows:

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();
}
}

The above are the commonly used js methods that I have used in recent projects. I have sorted them out. I hope your friends will like them.