JS+CSS实现的漂亮渐变背景特效代码(6个渐变效果)_javascript技巧

 
 
 
 var setGradient = (function() {
 var p_dCanvas = document.createElement('canvas');
 var p_useCanvas = !!(typeof(p_dCanvas.getContext) == 'function');
 var p_dCtx = p_useCanvas ? p_dCanvas.getContext('2d') : null;
 var p_isIE =
 /*@cc_on!@*/
 false;
 try {
 p_dCtx.canvas.toDataURL()
 } catch(err) {
 p_useCanvas = false;
 };
 if (p_useCanvas) {
 return function(dEl, sColor1, sColor2, bRepeatY) {
 if (typeof(dEl) == 'string') dEl = document.getElementById(dEl);
 if (!dEl) return false;
 var nW = dEl.offsetWidth;
 var nH = dEl.offsetHeight;
 p_dCanvas.width = nW;
 p_dCanvas.height = nH;
 var dGradient;
 var sRepeat;
 if (bRepeatY) {
 dGradient = p_dCtx.createLinearGradient(0, 0, nW, 0);
 sRepeat = 'repeat-y';
 } else {
 dGradient = p_dCtx.createLinearGradient(0, 0, 0, nH);
 sRepeat = 'repeat-x';
 }
 dGradient.addColorStop(0, sColor1);
 dGradient.addColorStop(1, sColor2);
 p_dCtx.fillStyle = dGradient;
 p_dCtx.fillRect(0, 0, nW, nH);
 var sDataUrl = p_dCtx.canvas.toDataURL('image/png');
 with(dEl.style) {
 backgroundRepeat = sRepeat;
 backgroundImage = 'url(' + sDataUrl + ')';
 backgroundColor = sColor2;
 };
 }
 } else if (p_isIE) {
 p_dCanvas = p_useCanvas = p_dCtx = null;
 return function(dEl, sColor1, sColor2, bRepeatY) {
 if (typeof(dEl) == 'string') dEl = document.getElementById(dEl);
 if (!dEl) return false;
 dEl.style.zoom = 1;
 var sF = dEl.currentStyle.filter;
 dEl.style.filter += ' ' + ['progid:DXImageTransform.Microsoft.gradient( GradientType=', +( !! bRepeatY), ',enabled=true,startColorstr=', sColor1, ', endColorstr=', sColor2, ')'].join('');
 };
 } else {
 p_dCanvas = p_useCanvas = p_dCtx = null;
 return function(dEl, sColor1, sColor2) {
 if (typeof(dEl) == 'string') dEl = document.getElementById(dEl);
 if (!dEl) return false;
 with(dEl.style) {
 backgroundColor = sColor2;
 };
 }
 }
 })();
 
 
 
 
 CSS特效代码。
 
 
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