10个很棒的jQuery代码片段

图片预加载

(function($) { 
 var cache = []; 
 // Arguments are image paths relative to the current page. 
 $.preLoadImages = function() { 
  var args_len = arguments.length; 
  for (var i = args_len; i--;) { 
   var cacheImage = document.createElement('img'); 
   cacheImage.src = arguments[i]; 
   cache.push(cacheImage); 
  } 
 } 
 
jQuery.preLoadImages("image1.gif", "/path/to/image2.png"); 

在新窗口打开链接 (target=”blank”)

$('a[@rel$='external']').click(function(){ 
   this.target = "_blank"; 
}); 
 
 

当支持 Javascript 时为 body 增加 class

 
$('body').addClass('hasJS'); 

平滑滚动页面到某个锚点

$(document).ready(function() { 
  $("a.toplink").click(function() { 
    $("html, body").animate({ 
      scrollTop: $($(this).attr("href")).offset().top + "px" 
    }, { 
      duration: 500, 
      easing: "swing" 
    }); 
    return false; 
  }); 
}); 

鼠标滑动时的渐入和渐出

$(document).ready(function(){ 
  $(".thumbs img").fadeTo("slow", 0.6); // This sets the opacity of the thumbs to fade down to 60% when the page loads 
 
  $(".thumbs img").hover(function(){ 
    $(this).fadeTo("slow", 1.0); // This should set the opacity to 100% on hover 
  },function(){ 
    $(this).fadeTo("slow", 0.6); // This should set the opacity back to 60% on mouseout 
  }); 
}); 

制作等高的列

var max_height = 0; 
$("div.col").each(function(){ 
  if ($(this).height() > max_height) { max_height = $(this).height(); } 
}); 
$("div.col").height(max_height); 

在一些老的浏览器上启用 HTML5 的支持

(function(){ 
  if(!0) 
    return; 
  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])} 
})() 
 
//然后在head中引入该js 
 

测试浏览器是否支持某些 CSS3 属性

var supports = (function() { 
  var div = document.createElement('div'), 
   vendors = 'Khtml Ms O Moz Webkit'.split(' '), 
   len = vendors.length; 
 
  return function(prop) { 
   if ( prop in div.style ) return true; 
 
   prop = prop.replace(/^[a-z]/, function(val) { 
     return val.toUpperCase(); 
   }); 
 
   while(len--) { 
     if ( vendors[len] + prop in div.style ) { 
      // browser supports box-shadow. Do what you need. 
      // Or use a bang (!) to test if the browser doesn't. 
      return true; 
     } 
   } 
   return false; 
  }; 
})(); 
 
if ( supports('textShadow') ) { 
  document.documentElement.className += ' textShadow'; 

获取 URL 中传递的参数

$.urlParam = function(name){ 
  var results = new RegExp('[\?&]' + name + '=([^&#]*)').exec(window.location.href); 
  if (!results) { return 0; } 
  return results[1] || 0; 
} 

禁用表单的回车键提交

$("#form").keypress(function(e) { 
 if (e.which == 13) { 
  return false; 
 } 
}); 

之前的《直接拿来用的15个jQuery代码片段》文章就很不错，不知道大家收藏了吗？现在再来一份，一样很棒！