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console 命令行工具 X clear 

                    

                        
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console

            
<h1 class="class1">Heading1</h1>
<p id="p1" class="class2" style="color:black">Paragraph段落</p>
<p id="p2"  class="class2 class1">Paragraph段落</p>

            
#p1{ font-size:24px;color:808080;}
.class1{text-align:center;background-color:#ffc0cb}
.class2{color:#008000;background-color:pink;}
#p