192月/130
10 个不错的 jQuery 代码片段
[代码] 图片预加载
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( function ($) { |
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var cache = []; |
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// Arguments are image paths relative to the current page. |
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$.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" ); |
[代码] 在新窗口打开链接 (target=”blank”)
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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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*/ |
[代码] 当支持 JavaScript 时为 body 增加 class
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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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$( 'body' ).addClass( 'hasJS' ); |
[代码] 平滑滚动页面到某个锚点
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$(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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}); |
[代码] 鼠标滑动时的渐入和渐出
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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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$( this ).fadeTo( "slow" , 0.6); // This should set the opacity back to 60% on mouseout |
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}); |
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}); |
[代码] 制作等高的列
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var max_height = 0; |
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$( "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); |
[代码] 在一些老的浏览器上启用 HTML5 的支持
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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]--> |
[代码] 测试浏览器是否支持某些 CSS3 属性
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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' ; |
[代码] 获取 URL 中传递的参数
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$.urlParam = function (name){ |
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var results = new RegExp( '[\\?&]' + name + '=([^&#]*)' ).exec(window.location.href); |
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if (!results) { return 0; } |
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return results[1] || 0; |
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} |
[代码] 禁用表单的回车键提交
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$( "#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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}); |
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