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console 命令行工具 X clear 

                    

                        
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console

            
 
 
         $(".h1").click(function(){
            $(".h1").css("background","red").css("width","520px").animate(3000)
         });
         $("#but").click(function(){
            $(".h1").css("background","#000").css("width","520px")
         });


            
<h1 class="h1">你好</h1>
    <p  id="p1">你好</p>
    <button id="but">点击</button>
    <h3 class="h3"  style="display:none;"></h3>
    

            

                
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