javascript把输入的数字或字母变成****

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML> <HEAD>  <TITLE> New Document </TITLE>  <META NAME="Generator" CONTENT="EditPlus">  <META NAME="Author" CONTENT="">  <META NAME="Keywords" CONTENT="">  <META NAME="Description" CONTENT=""> </HEAD> <BODY>  <SCRIPT LANGUAGE="JavaScript">  <!-- function Test(obj){  var str=obj.value;    if(str.length>3&&str.length<8){   str=str.substr(0,str.length-1);   str=str+"*";  }  obj.value=str; }  //-->  </SCRIPT><input type="text" onkeyup="Test(this)"/> </BODY></HTML>