1. 禁止右键点击

$(document).ready(function(){
      $(document).bind("contextmenu",function(e){
               return false;
           });
});



 

2.隐藏搜索文本框文字

$(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

$(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";
	});
});

4. 检测浏览器

$(document).ready(function() {
	// Target Firefox 2 and above
	if ($.browser.mozilla && $.browser.version >= "1.8" ){
	  // do something
	}   

	// Target Safari
	if( $.browser.safari ){
	  // do something
	}   

	// Target Chrome
	if( $.browser.chrome){
	   // do something
	}   

	// Target Camino
	if( $.browser.camino){
	   // do something
	}   

	// Target Opera
	if( $.browser.opera){
	   // do something
	}   

	// Target IE6 and below
	if ($.browser.msie && $.browser.version <= 6 ){
	   // do something
	}   

	// Target anything above IE6
	if ($.browser.msie && $.browser.version > 6){
	   // do something
	}
});

5. 预加载图片

$(document).ready(function() {
	jQuery.preloadImages = function(){
	  for(var i = 0; i).attr("src", arguments[i]);
	}
	// how to use
	$.preloadImages("image1.jpg");
});

6. 页面样式切换

$(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 href="default.css" type=text/css rel=stylesheet>
	// 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

$(document).ready(function() {
	function equalHeight(group) {
	   tallest = 0;
	   group.each(function() {
	       thisHeight = $(this).height();
	       if(thisHeight > tallest) {
	           tallest = thisHeight;
	       }
	   });
		group.height(tallest);
	}
    equalHeight($(".left"));
    equalHeight($(".right"));
});

8. 动态控制页面字体大小

$(document).ready(function() {
	var originalFontSize = $('html').css('font-size');
	$(".resetFont").click(function(){
		$('html').css('font-size', originalFontSize);
	});
	$(".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;
	});
	$(".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

$(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>   
});

10. 与其他Javascript类库冲突解决方案

$(document).ready(function() {   
   var $jq = jQuery.noConflict();   
   $jq('#id').show();   
});

11.获得鼠标指针XY值

$(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

$(document).ready(function() {   
  if ($('#id').html()) {   
   // do something   
   }   
});

13. 替换元素

$(document).ready(function() {   
   $('#id').replaceWith('<DIV>I have been replaced</DIV>');
});

14. jQuery延时加载功能

$(document).ready(function() {   
   window.setTimeout(function() {   
     // do something   
   }, 1000);   
});

15. 移除单词功能

$(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

$(document).ready(function() {   
   if ($('#id').length) {   
  // do something   
  }   
});

17. 使整个div可点击

$(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

$(document).ready(function() {   
      function checkWindowSize() {   
       if ( $(window).width() > 1200 ) {   
           $('body').addClass('large');   
       }   
       else {   
           $('body').removeClass('large');   
       }   
      }   
$(window).resize(checkWindowSize);   
});

19. 克隆对象

$(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

$(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

$(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

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

23. 使用自己的 Bullets

$(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

<SCRIPT src="http://www.google.com/jsapi"></SCRIPT>
<SCRIPT type=text/javascript>  
google.load("jquery", "1.2.6"); 
google.setOnLoadCallback(function() {  
    // do something  
});  
</SCRIPT>
<SCRIPT src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js" type=text/javascript></SCRIPT>

25. 禁用Jquery(动画)效果

$(document).ready(function() {   
    jQuery.fx.off = true;   
});

原文url:http://www.cnblogs.com/ywqu/archive/2010/03/01/1675355.html