10.2.20 sub方法.html

javascript即用即差核心对象手册

<script>
   var str="this is a test"
   with (document)
   {
       write("原是字符串："+str);
       write("<br>");
       write("sub方法作用后:"+str.sub());
       write("  A"+"1".sub()+"  b"+"left".sub());
       write("<br>");
       write("sub方法的返回值"+"<input type='text' size=30 value='"+str.sub()+"'>");
   }
</script>