十 个很棒的 jQuery 代码片段(转)
10 个很棒的 jQuery 代码片段(转)
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var cache = [];
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// Arguments are image paths relative to the current page.
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$.preLoadImages = function () {
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var args_len = arguments.length;
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for ( var i = args_len; i--;) {
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var cacheImage = document.createElement( 'img' );
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cacheImage.src = arguments[i];
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cache.push(cacheImage);
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}
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}
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jQuery.preLoadImages( "image1.gif" , "/path/to/image2.png" );
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2. [代码]在新窗口打开链接 (target=”blank”) 跳至[1][2][3][4][5][6][7][8][9][10][全屏预览]
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$( 'a[@rel$=' external ']' ).click( function (){
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this .target = "_blank" ;
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}); |
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/* |
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Usage:
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<a href="http://www.catswhocode.com" rel="external">catswhocode.com</a>
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*/ |
3. [代码]当支持 JavaScript 时为 body 增加 class 跳至[1][2][3][4][5][6][7][8][9][10][全屏预览]
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/* 该代码只有1行,但是最简单的用来检测浏览器是否支持 JavaScript 的方法,如果支持 JavaScript 就在 body 元素增加一个 hasJS 的 class */ |
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$( 'body' ).addClass( 'hasJS' );
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4. [代码]平滑滚动页面到某个锚点 跳至[1][2][3][4][5][6][7][8][9][10][全屏预览]
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$(document).ready( function () {
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$( "a.topLink" ).click( function () {
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$( "html, body" ).animate({
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scrollTop: $($( this ).attr( "href" )).offset().top + "px"
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}, {
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duration: 500,
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easing: "swing"
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});
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return false ;
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});
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}); |
5. [代码]鼠标滑动时的渐入和渐出 跳至[1][2][3][4][5][6][7][8][9][10][全屏预览]
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$(document).ready( function (){
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$( ".thumbs img" ).fadeTo( "slow" , 0.6); // This sets the opacity of the thumbs to fade down to 60% when the page loads
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$( ".thumbs img" ).hover( function (){
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$( this ).fadeTo( "slow" , 1.0); // This should set the opacity to 100% on hover
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}, function (){
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$( this ).fadeTo( "slow" , 0.6); // This should set the opacity back to 60% on mouseout
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});
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}); |
6. [代码]制作等高的列 跳至[1][2][3][4][5][6][7][8][9][10][全屏预览]
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var max_height = 0;
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$( "div.col" ).each( function (){
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if ($( this ).height() > max_height) { max_height = $( this ).height(); }
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}); |
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$( "div.col" ).height(max_height);
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7. [代码]在一些老的浏览器上启用 HTML5 的支持 跳至[1][2][3][4][5][6][7][8][9][10][全屏预览]
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( function (){
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if (! /*@cc_on!@*/ 0)
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return ;
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var e = "abbr,article,aside,audio,bb,canvas,datagrid,datalist,details,dialog,eventsource,figure,footer,header,hgroup,mark,menu,meter,nav,output,progress,section,time,video" .split( ',' ),i=e.length; while (i--){document.createElement(e[i])}
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})() |
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//然后在head中引入该js |
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<!--[ if lt IE 9]>
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<script src= "http://html5shim.googlecode.com/svn/trunk/html5.js" ></script>
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<![endif]--> |
8. [代码]测试浏览器是否支持某些 CSS3 属性 跳至[1][2][3][4][5][6][7][8][9][10][全屏预览]
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var supports = ( function () {
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var div = document.createElement( 'div' ),
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vendors = 'Khtml Ms O Moz Webkit' .split( ' ' ),
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len = vendors.length;
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return function (prop) {
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if ( prop in div.style ) return true ;
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prop = prop.replace(/^[a-z]/, function (val) {
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return val.toUpperCase();
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});
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while (len--) {
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if ( vendors[len] + prop in div.style ) {
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// browser supports box-shadow. Do what you need.
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// Or use a bang (!) to test if the browser doesn't.
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return true ;
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}
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}
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return false ;
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};
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})(); |
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if ( supports( 'textShadow' ) ) {
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document.documentElement.className += ' textShadow' ;
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9. [代码]获取 URL 中传递的参数 跳至[1][2][3][4][5][6][7][8][9][10][全屏预览]
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$.urlParam = function (name){
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var results = new RegExp( '[\\?&]' + name + '=([^&#]*)' ).exec(window.location.href);
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if (!results) { return 0; }
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return results[1] || 0;
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} |
10. [代码]禁用表单的回车键提交 跳至[1][2][3][4][5][6][7][8][9][10][全屏预览]
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$( "#form" ).keypress( function (e) {
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if (e.which == 13) {
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return false ;
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}
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}); |