这里有新鲜出炉的 Javascript 教程,程序狗速度看过来!
Javascript 是一种由 Netscape 的 LiveScript 发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言,主要目的是为了解决服务器端语言,比如 Perl,遗留的速度问题,为客户提供更流畅的浏览效果。
这篇文章主要介绍了 JS+CSS 实现的漂亮渐变背景特效代码, 包含 6 个渐变效果, 涉及 JavaScript 针对页面元素属性动态操作的相关技巧, 需要的朋友可以参考下
本文实例讲述了 JS+CSS 实现的漂亮渐变背景特效代码。分享给大家供大家参考,具体如下:
运行效果截图如下:
具体代码如下:
- <html>
- <head>
- <title>
- JS配合CSS实现的漂亮渐变背景特效6个实例
- </title>
- <script>
- 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;
- };
- }
- }
- })();
- </script>
- <style>
- body{font:0.75em/1.4 Arial;text-align:left;margin:20px;} hr{clear:both;visibility:hidden;}
- xmp{font:12px/12px "Courier New";background:#fff;color:#666; border:solid
- 1px #ccc;} div.example{ border:solid 1px #555;margin:0 20px 20px 0;float:left;
- display:inline;margin:1em;background:#fff;width:300px;padding:40px;color:#222;font:xx-small/1.2
- "Tahoma";text-align:justify;}
- </style>
- <body>
- <div id="example1" class="example">
- CSS特效代码。
- </div>
- <div id="example2" class="example">
- 各类编程源码、
- </div>
- <div id="example3" class="example">
- 精品软件
- </div>
- <div id="example4" class="example">
- 上海世博园
- </div>
- <div id="example5" class="example">
- 我家北京天安门
- </div>
- <div id="example6" class="example">
- 北京欢迎您!
- </div>
- <script>
- setGradient('example1', '#4ddbbe', '#d449cc', 1);
- setGradient('example2', '#46ddbd', '#d8b617', 0);
- setGradient('example3', '#c81fc1', '#bf445f', 1);
- setGradient('example4', '#2285e5', '#d769eb', 0);
- setGradient('example5', '#8b4286', '#eac87d', 1);
- setGradient('example6', 'black', 'white', 0);
- </script>
- </body>
- </html>
希望本文所述对大家 JavaScript 程序设计有所帮助。
来源: http://www.phperz.com/article/17/0404/266566.html