26个Jquery使用小技巧下面列出了一些Jquery使用技巧。比如有禁止右键点击、隐藏搜索文本框文字、在新窗口中打开链接、检测浏览器、预加载图片、页面样式切换、所有列等高、动态控制页面字体大小、获得鼠标指针的X值Y值、验证元素是否为空、替换元素、延迟加载、验证元素是否存在于Jquery集合中、使DIV可点击、克隆对象、使元素居中、计算元素个数、使用Google主机上的Jquery类库、禁用Jquery效果、解决Jquery类库与其他Javascript类库冲突问题。 1. 禁止右键点击12345$(document).ready(function(){    $(document).bind("contextmenu",function(e){        return false;    });});2. 隐藏搜索文本框文字Hide when clicked in the search field, the value.(example can be found below in the comment fields)1234567891011121314$(document).ready(function() {$("input.text1").val("Enter your search text here");   textFill($('input.text1'));});      function textFill(input){ //input focus text function    var originalvalue = input.val();    input.focus( function(){        if( $.trim(input.val()) == originalvalue ){ input.val(''); }    });    input.blur( function(){        if( $.trim(input.val()) == '' ){ input.val(originalvalue); }    });}3. 在新窗口中打开链接XHTML 1.0 Strict doesn’t allow this attribute in the code, so use this to keep the code valid.1234567891011$(document).ready(function() {   //Example 1: Every link will open in a new window   $('a[href^="http://"]').attr("target", "_blank");     //Example 2: Links with the rel="external" attribute will only open in a new window   $('a[@rel$='external']').click(function(){      this.target = "_blank";   });});// how to use<A href="http://www.opensourcehunter.com" rel=external>open link</A>4. 检测浏览器注: 在版本jQuery 1.4中，$.support 替换掉了$.browser 变量123456789101112131415161718192021222324252627282930313233343536$(document).ready(function() {// Target Firefox 2 and aboveif ($.browser.mozilla && $.browser.version >= "1.8" ){    // do something} // Target Safariif( $.browser.safari ){    // do something} // Target Chromeif( $.browser.chrome){    // do something} // Target Caminoif( $.browser.camino){    // do something} // Target Operaif( $.browser.opera){    // do something} // Target IE6 and belowif ($.browser.msie && $.browser.version <= 6 ){    // do something} // Target anything above IE6if ($.browser.msie && $.browser.version > 6){    // do something}});5. 预加载图片This piece of code will prevent the loading of all images, which can be useful if you have a site with lots of images.123456789$(document).ready(function() {jQuery.preloadImages = function(){  for(var i = 0; i<ARGUMENTS.LENGTH; jQuery(?<img { i++)>").attr("src", arguments[i]);  }}// how to use$.preloadImages("image1.jpg");});6. 页面样式切换12345678910111213$(document).ready(function() {    $("a.Styleswitcher").click(function() {        //swicth the LINK REL attribute with the value in A REL attribute        $('link[rel=stylesheet]').attr('href' , $(this).attr('rel'));    });// how to use// place this in your header<LINK rel=stylesheet type=text/css href="default.css">// the links<A class="Styleswitcher" href="#" rel=default.css>Default Theme</A><A class="Styleswitcher" href="#" rel=red.css>Red Theme</A><A class="Styleswitcher" href="#" rel=blue.css>Blue Theme</A>});7. 列高度相同如果使用了两个CSS列，使用此种方式可以是两列的高度相同。1234567891011121314151617$(document).ready(function() {function equalHeight(group) {    tallest = 0;    group.each(function() {        thisHeight = $(this).height();        if(thisHeight > tallest) {            tallest = thisHeight;        }    });    group.height(tallest);}// how to use$(document).ready(function() {    equalHeight($(".left"));    equalHeight($(".right"));});});8. 动态控制页面字体大小用户可以改变页面字体大小1234567891011121314151617181920212223$(document).ready(function() {  // Reset the font size(back to default)  var originalFontSize = $('html').css('font-size');    $(".resetFont").click(function(){    $('html').css('font-size', originalFontSize);  });  // Increase the font size(bigger font0  $(".increaseFont").click(function(){    var currentFontSize = $('html').css('font-size');    var currentFontSizeNum = parseFloat(currentFontSize, 10);    var newFontSize = currentFontSizeNum*1.2;    $('html').css('font-size', newFontSize);    return false;  });  // Decrease the font size(smaller font)  $(".decreaseFont").click(function(){    var currentFontSize = $('html').css('font-size');    var currentFontSizeNum = parseFloat(currentFontSize, 10);    var newFontSize = currentFontSizeNum*0.8;    $('html').css('font-size', newFontSize);    return false;  });});9. 返回页面顶部功能For a smooth(animated) ride back to the top(or any location).123456789101112131415161718192021$(document).ready(function() {$('a[href*=#]').click(function() { if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') && location.hostname == this.hostname) {   var $target = $(this.hash);   $target = $target.length && $target   || $('[name=' + this.hash.slice(1) +']');   if ($target.length) {  var targetOffset = $target.offset().top;  $('html,body')  .animate({scrollTop: targetOffset}, 900);    return false;   }  }  });// how to use// place this where you want to scroll to<A name=top></A>// the link<A href="#top">go to top</A>});11. 获得鼠标指针ＸＹ值Want to know where your mouse cursor is?123456789$(document).ready(function() {   $().mousemove(function(e){     //display the x and y axis values inside the div with the id XY    $('#XY').html("X Axis : " + e.pageX + " | Y Axis " + e.pageY);  });// how to use<DIV id=XY></DIV> });12. 验证元素是否为空This will allow you to check if an element is empty.12345$(document).ready(function() {  if ($('#id').html()) {   // do something   }});13. 替换元素Want to replace a div, or something else?123456$(document).ready(function() {   $('#id').replaceWith('<DIV>I have been replaced</DIV> ');});14. jQuery延时加载功能Want to delay something?12345$(document).ready(function() {   window.setTimeout(function() {     // do something   }, 1000);});15. 移除单词功能Want to remove a certain word(s)?1234$(document).ready(function() {   var el = $('#id');   el.html(el.html().replace(/word/ig, ""));});16. 验证元素是否存在于jquery对象集合中Simply test with the .length property if the element exists.12345$(document).ready(function() {   if ($('#id').length) {  // do something  }});17. 使整个DIV可点击Want to make the complete div clickable?123456789$(document).ready(function() {    $("div").click(function(){      //get the url from href attribute and launch the url      window.location=$(this).find("a").attr("href"); return false;    });// how to use<DIV><A href="index.html">home</A></DIV> });18. ID与Class之间转换.当改变Window大小时，在ID与Class之间切换1234567891011$(document).ready(function() {   function checkWindowSize() {    if ( $(window).width() > 1200 ) {        $('body').addClass('large');    }    else {        $('body').removeClass('large');    }   }$(window).resize(checkWindowSize);});19. 克隆对象Clone a div or an other element.123456$(document).ready(function() {   var cloned = $('#id').clone();// how to use<DIV id=id></DIV> });20. 使元素居屏幕中间位置Center an element in the center of your screen.123456789$(document).ready(function() {  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;  }  $("#id").center();});21. 写自己的选择器Write your own selectors.1234567891011$(document).ready(function() {   $.extend($.expr[':'], {       moreThen1000px: function(a) {           return $(a).width() > 1000;      }   });  $('.box:moreThen1000px').click(function() {      // creating a simple js alert box      alert('The element that you have clicked is over 1000 pixels wide');  });});22. 统计元素个数Count an element.123$(document).ready(function() {   $("p").size();});23. 使用自己的 BulletsWant to use your own bullets instead of using the standard or images bullets?123456$(document).ready(function() {   $("ul").addClass("Replaced");   $("ul > li").prepend("? "); // how to use ul.Replaced { list-style : none; }});24. 引用Google主机上的Jquery类库Let Google host the jQuery script for you. This can be done in 2 ways.1234567891011//Example 1<SCRIPT src="//www.google.com/jsapi"></SCRIPT><SCRIPT type=text/javascript>google.load("jquery", "1.2.6");google.setOnLoadCallback(function() {    // do something});</SCRIPT><SCRIPT type=text/javascript src="//ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></SCRIPT>  // Example 2:(the best and fastest way)<SCRIPT type=text/javascript src="//ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></SCRIPT>25. 禁用Jquery（动画）效果Disable all jQuery effects123$(document).ready(function() {    jQuery.fx.off = true;});26. 与其他Javascript类库冲突解决方案To avoid conflict other libraries on your website, you can use this jQuery Method, and assign a different variable name instead of the dollar sign.1234$(document).ready(function() {   var $jq = jQuery.noConflict();   $jq('#id').show();});英文原文：26-cool-and-usefull-jquery-tips-tricks-solutions