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console 命令行工具 X clear 

                    

                        
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console

            
document.write(document.getElementById("mySelect").form.id)

            
<form id="myForm"> 
  <select id="mySelect"> <option>苹果</option> <option>桃子</option> <option>香蕉</option> <option>桔子</option> </select> 
 </form> 
 <p>该表单的 id 是：  </p>