SOURCE

console 命令行工具 X clear 

                    

                        
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console

            
function selText()
{
document.getElementById("myText").select()
}

            
<form> 
  <input size="25" type="text" id="myText" value="选定我吧！"> 
  <input type="button" value="选择文本" onclick="selText()"> 
 </form>