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console 命令行工具 X clear 

                    

                        
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console

            
<div class="box"></div>
<div class="box2"></div>
<div class="box3"></div>
<div class="box4"></div>
  



            
.box{width:15px;height:15px;background:url("http://suo.im/4hI18a") no-repeat 0px -26px;}
.box2{width:15px;height:15px;background:url("http://suo.im/4hI18a") no-repeat -25px 0px;}
.box3{width:20px;height:20px;background:url("http://suo.im/4hI18a") no-repeat -50px -25px;}
.box4{width:40px;height:20px;background:url("http://suo.im/4hI18a") no-repeat -150px -75px;}