分享12个实用的jQuery代码片段

$(document).ready(function() { //select all anchor tags that have http in the href //and apply the target=_blank $("a[href^='http']").attr('target','_blank');}); 

$(document).ready(function() { window.setTimeout(function() { // some code }, 500);});

<div class="equalHeight" style="border:1px solid"> <p>First Line</p> <p>Second Line</p> <p>Third Line</p></div><div class="equalHeight" style="border:1px solid"> <p>Column Two</p></div><script src="http://apps.bdimg.com/libs/jquery/1.11.1/jquery.min.js"></script><script>$(document).ready(function() { equalHeight('.equalHeight');});//global variable, this will store the highest height valuevar maxHeight = 0;function equalHeight(col) { //Get all the element with class = col col = $(col); //Loop all the col col.each(function() { //Store the highest value if ($(this).height() > maxHeight) { maxHeight = $(this).height(); } }); //Set the height col.height(maxHeight);}</script>

jQuery.preloadImagesInWebPage = function() { for (var ctr = 0; ctr & lt; arguments.length; ctr++) { jQuery("").attr("src", arguments[ctr]); }}// 使用方法：$.preloadImages("image1.gif", "image2.gif", "image3.gif");// 检查图片是否被加载$('#imageObject').attr('src', 'image1.gif').load(function() { alert('The image has been loaded…');});

<div id="foo" style="width:200px;height: 200px;background: #ccc;"></div><script src="http://apps.bdimg.com/libs/jquery/1.11.1/jquery.min.js"></script><script type="text/javascript">jQuery.fn.center = function() { this.css("position", "absolute"); this.css("top", ($(window).height() - this.height()) / 2 + $(window).scrollTop() + "px"); this.css("left", ($(window).width() - this.width()) / 2 + $(window).scrollLeft() + "px"); return this;}//Use the above function as:$('#foo').center();</script> 

$(document).ready(function() { //catch the right-click context menu $(document).bind("contextmenu", function(e) { //warning prompt - optional alert("No right-clicking!"); //delete the default context menu return false; });});

<div id="foo"> <div id="bar"></div> <div id="baz"> <div id="biz"></div> <span><span></span></span> </div></div><script src="http://apps.bdimg.com/libs/jquery/1.11.1/jquery.min.js"></script><script type="text/javascript"> //jQuery code to count child elements $("#foo > div").size()alert($("#foo > div").size())</script>

 $(document).ready(function() { $("a.cssSwap").click(function() {  //swap the link rel attribute with the value in the rel  $('link[rel=stylesheet]').attr('href' , $(this).attr('rel'));  });  });

 $(document).ready(function() { //find the current font size var originalFontSize = $('html').css('font-size');//Increase the text size $(".increaseFont").click(function() { var currentFontSize = $('html').css('font-size'); var currentFontSizeNumber = parseFloat(currentFontSize, 10);var newFontSize = currentFontSizeNumber*1.2; $('html').css('font-size', newFontSize); return false; });//Decrease the Text Size $(".decreaseFont").click(function() { var currentFontSize = $('html').css('font-size'); var currentFontSizeNum = parseFloat(currentFontSize, 10);var newFontSize = currentFontSizeNum*0.8; $('html').css('font-size', newFontSize); return false; });// Reset Font Size $(".resetFont").click(function(){ $('html').css('font-size', originalFontSize); }); });

 $(document).ready(function() { $().mousemove(function(e) { $('# MouseCoordinates ').html("X Axis Position = " + e.pageX + " and Y Axis Position = " + e.pageY); });

 $().mousemove(function(e){ //display the x and y axis values inside the P element $('p').html("X Axis : " + e.pageX + " | Y Axis " + e.pageY); });

 $(document).ready(function() { //when the id="top" link is clicked $('#top').click(function() { //scoll the page back to the top $(document).scrollTo(0,500); } });