input文本框的值_Input文本框随着输入内容多少自动延伸的实现

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<script language="javascript">

functioncheckLength(which) {

  varoTextCount = document.getElementById("char"); 

  iCount = which.value.replace(/[^/u0000-/u00ff]/g,"aa");

  oTextCount.innerHTML =""+ iCount.length+"";

  which.style.border ='1px dotted #FF0000';

which.size=iCount.length+2;

}

 </script>

words"size="2" onkeyup="checkLength(this)"/>

  0个字符

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