SOURCE

console 命令行工具 X clear 

                    

                        
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console

            
// 输出标题：
document.getElementById("myH1").innerHTML="Welcome to my Homepage";
// 输出段落：
document.getElementById("myP").innerHTML="This is my first paragraph.";

            
<h1 id="myH1"></h1> 
 <p id="myP"></p>  
 <p><b>注释：</b>注释不会被执行。</p>