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\((\d+),\s*(\d+),\s*(\d+)(,\s*\d+\.\d+)*\)$)/; if (pattern.test(value)) { result = value; } else if (rgbRegex.test(value)) { //rgba(0, 0, 0, 0) result = value; } return result; }
将RGB转化为HEX:
1 function zero_fill_hex(num, digits) { 2 var s = num.toString(16); 3 while (s.length < digits) { 4 s = "0" + s; 5 } 6 return s; 7 } 8 9 function rgb2hex(rgb) { 10 if (rgb.charAt(0) == ‘#‘) { 11 return rgb; 12 } 13 var ds = rgb.split(/\D+/); 14 var decimal = Number(ds[1]) * 65536 + Number(ds[2]) * 256 + Number(ds[3]); 15 return "#" + zero_fill_hex(decimal, 6); 16 }
验证是否为Email地址:
1 function testEmail (value, target) { 2 value = value.trim(); 3 if (!/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.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 = 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 }
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