10个很不错的jQuery特效分享

10个很不错的jQuery特效分享

1.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");

2. 在新窗口打开链接 (target=”blank”)

$('a[@rel$='external']').click(function(){
  this.target = "_blank";
});
 
/*
 Usage:
 <a href="http://www.catswhocode.com" rel="external">catswhocode.com</a>
*/

3.当支持 JavaScript 时为 body 增加 class

/* 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 */

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

4.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;
 });
});

5. 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
 });
});

6. 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);

7. 在一些老的浏览器上启用 HTML5 的支持

(function(){
 if(!/*@cc_on!@*/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
<!--[if lt IE 9]>
<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
8.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';

9. 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;
}

10. 禁用表单的回车键提交

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