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26 个 jQuery使用技巧

分类: 文章 • 2025-01-16 10:56:52

The use of the jQuery library is growing and growing(just released jQuery 1.4), more and more people are using this useful javascript library. This means that more and more useful jQuery tips, tricks and solutions are coming available. That’s why i created a small list of 26 cool and useful jQuery tips, tricks and solutions.



1. 禁用右键点击（Disable right-click）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. $(document).bind("contextmenu",function(e){
  3. returnfalse;
  4. });
  5. });


2. 禁用搜索文本框（Disappearing search field text）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. $("input.text1").val("Enteryoursearchtexthere");
  3. textFill($('input.text1'));
  4. });
  6. functiontextFill(input){//inputfocustextfunction
  7. varoriginalvalue=input.val();
  8. input.focus(function(){
  9. if($.trim(input.val())==originalvalue){input.val('');}
  10. });
  11. input.blur(function(){
  12. if($.trim(input.val())==''){input.val(originalvalue);}
  13. });
  14. }


3. 新窗口打开链接（Opening links in a new window）

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  1. $(document).ready(function(){
  2. //Example1:Everylinkwillopeninanewwindow
  3. $('a[href^="http://"]').attr("target","_blank");
  5. //Example2:Linkswiththerel="external"attributewillonlyopeninanewwindow
  6. $('a[@rel$='external']').click(function(){
  7. this.target="_blank";
  8. });
  9. });
  10. //howtouse
  11. <ahref="http://www.opensourcehunter.com"rel="external">openlink</a>


4. 检测浏览器（Detect browser）

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  1. $(document).ready(function(){
  2. //TargetFirefox2andabove
  3. if($.browser.mozilla&&$.browser.version>="1.8"){
  4. //dosomething
  5. }
  7. //TargetSafari
  8. if($.browser.safari){
  9. //dosomething
  10. }
  12. //TargetChrome
  13. if($.browser.chrome){
  14. //dosomething
  15. }
  17. //TargetCamino
  18. if($.browser.camino){
  19. //dosomething
  20. }
  22. //TargetOpera
  23. if($.browser.opera){
  24. //dosomething
  25. }
  27. //TargetIE6andbelow
  28. if($.browser.msie&&$.browser.version<=6){
  29. //dosomething
  30. }
  32. //TargetanythingaboveIE6
  33. if($.browser.msie&&$.browser.version>6){
  34. //dosomething
  35. }
  36. });


5. 预加载图片（Preloading images）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. jQuery.preloadImages=function()
  3. {
  4. for(vari=0;i<arguments.length;i++)=""{=""jquery("<img="">").attr("src",arguments[i]);
  5. }
  6. }
  7. //howtouse
  8. $.preloadImages("image1.jpg");
  9. });
  10. </arguments.length;>


6. 样式筛选（CSS Style switcher）

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  1. $(document).ready(function(){
  2. $("a.Styleswitcher").click(function(){
  3. //swicththeLINKRELattributewiththevalueinARELattribute
  4. $('link[rel=stylesheet]').attr('href',$(this).attr('rel'));
  5. });
  6. //howtouse
  7. //placethisinyourheader
  8. <linkrel="stylesheet"href="default.css"type="text/css">
  9. //thelinks
  10. <ahref="#"class="Styleswitcher"rel="default.css">DefaultTheme</a>
  11. <ahref="#"class="Styleswitcher"rel="red.css">RedTheme</a>
  12. <ahref="#"class="Styleswitcher"rel="blue.css">BlueTheme</a>
  13. });


7. 列高度相同（Columns of equal height）

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  1. $(document).ready(function(){
  2. functionequalHeight(group){
  3. tallest=0;
  4. group.each(function(){
  5. thisHeight=$(this).height();
  6. if(thisHeight>tallest){
  7. tallest=thisHeight;
  8. }
  9. });
  10. group.height(tallest);
  11. }
  12. //howtouse
  13. $(document).ready(function(){
  14. equalHeight($(".left"));
  15. equalHeight($(".right"));
  16. });
  17. });


8. 字体大小调整（Font resizing）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. //Resetthefontsize(backtodefault)
  3. varoriginalFontSize=$('html').css('font-size');
  4. $(".resetFont").click(function(){
  5. $('html').css('font-size',originalFontSize);
  6. });
  7. //Increasethefontsize(biggerfont0
  8. $(".increaseFont").click(function(){
  9. varcurrentFontSize=$('html').css('font-size');
  10. varcurrentFontSizeNum=parseFloat(currentFontSize,10);
  11. varnewFontSize=currentFontSizeNum*1.2;
  12. $('html').css('font-size',newFontSize);
  13. returnfalse;
  14. });
  15. //Decreasethefontsize(smallerfont)
  16. $(".decreaseFont").click(function(){
  17. varcurrentFontSize=$('html').css('font-size');
  18. varcurrentFontSizeNum=parseFloat(currentFontSize,10);
  19. varnewFontSize=currentFontSizeNum*0.8;
  20. $('html').css('font-size',newFontSize);
  21. returnfalse;
  22. });
  23. });



9. 返回页面顶部（Smooth(animated) page scroll）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. $('a[href*=#]').click(function(){
  3. if(location.pathname.replace(/^\//,'')==this.pathname.replace(/^\//,'')
  4. &&location.hostname==this.hostname){
  5. var$target=$(this.hash);
  6. $target=$target.length&&$target
  7. ||$('[name='+this.hash.slice(1)+']');
  8. if($target.length){
  9. vartargetOffset=$target.offset().top;
  10. $('html,body')
  11. .animate({scrollTop:targetOffset},900);
  12. returnfalse;
  13. }
  14. }
  15. });
  16. //howtouse
  17. //placethiswhereyouwanttoscrollto
  18. <aname="top"></a>
  19. //thelink
  20. <ahref="#top">gototop</a>
  21. });



11. 获取鼠标的xy坐标（Get the mouse cursor x and y axis）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. $().mousemove(function(e){
  3. //displaythexandyaxisvaluesinsidethedivwiththeidXY
  4. $('#XY').html("XAxis:"+e.pageX+"|YAxis"+e.pageY);
  5. });
  6. //howtouse
  7. <divid="XY"></div>
  9. });



12. 验证元素是否为空（Verify if an Element is empty）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. if($('#id').html()){
  3. //dosomething
  4. }
  5. });

13. 替换元素（Replace a element）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. $('#id').replaceWith('
  3. <div>Ihavebeenreplaced</div>
  5. ');
  6. });

14. 延迟加载（jQuery timer callback functions）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. window.setTimeout(function(){
  3. //dosomething
  4. },1000);
  5. });

15. 移除单词（Remove a word）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. varel=$('#id');
  3. el.html(el.html().replace(/word/ig,""));
  4. });

16. 验证元素是否存在（Verify that an element exists in jQuery）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. if($('#id').length){
  3. //dosomething
  4. }
  5. });

17. 使整个DIV可点击（Make the entire DIV clickable）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. $("div").click(function(){
  3. //gettheurlfromhrefattributeandlaunchtheurl
  4. window.location=$(this).find("a").attr("href");returnfalse;
  5. });
  6. //howtouse
  7. <div><ahref="index.html">home</a></div>
  9. });

18. id和class切换（Switch between classes or id’s when resizing the window）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. functioncheckWindowSize(){
  3. if($(window).width()>1200){
  4. $('body').addClass('large');
  5. }
  6. else{
  7. $('body').removeClass('large');
  8. }
  9. }
  10. $(window).resize(checkWindowSize);
  11. });


19. 克隆对象（Clone a object）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. varcloned=$('#id').clone();
  3. //howtouse
  4. <divid="id"></div>
  6. });


20. 使元素居中屏幕（Center an element on the screen）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. jQuery.fn.center=function(){
  3. this.css("position","absolute");
  4. this.css("top",($(window).height()-this.height())/2+$(window).scrollTop()+"px");
  5. this.css("left",($(window).width()-this.width())/2+$(window).scrollLeft()+"px");
  6. returnthis;
  7. }
  8. $("#id").center();
  9. });


21. 自定义选择器（Write our own selector）

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  1. $(document).ready(function(){
  2. $.extend($.expr[':'],{
  3. moreThen1000px:function(a){
  4. return$(a).width()>1000;
  5. }
  6. });
  7. $('.box:moreThen1000px').click(function(){
  8. //creatingasimplejsalertbox
  9. alert('Theelementthatyouhaveclickedisover1000pixelswide');
  10. });
  11. });


22. 统计元素个数（Count a element）

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  1. $(document).ready(function(){
  2. $("p").size();
  3. });


23. 自定义Bullets（Use Your Own Bullets）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. $("ul").addClass("Replaced");
  3. $("ul>li").prepend("‒");
  4. //howtouse
  5. ul.Replaced{list-style:none;}
  6. });


24. 引用google分发的jQuery（Let Google host jQuery for you）

[javascript]view plaincopyprint?
  1. //Example1
  2. <scriptsrc="http://www.google.com/jsapi"></script>
  3. <scripttype="text/javascript">
  4. google.load("jquery","1.2.6");
  5. google.setOnLoadCallback(function(){
  6. //dosomething
  7. });
  8. </script><scriptsrc="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"type="text/javascript"></script>
  10. //Example2:(thebestandfastestway)
  11. <scripttype="text/javascript"src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>


25. 禁用jQuery动画（Disable jQuery animations）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. jQuery.fx.off=true;
  3. });


26. 防止不兼容冲突（No conflict-mode）

[javascript]view plaincopyprint?
  1. $(document).ready(function(){
  2. var$jq=jQuery.noConflict();
  3. $jq('#id').show();
  4. });


jquery 速查表：

26 个 jQuery使用技巧




参考推荐：
jQuery
jQuery UI
14 days of jQuery
Learning jQuery
Cheatsheet jQuery 1.1.3
Improve your jQuery – 25 excellent tips

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