输入文字自动变化宽度的INPUT,带计数（图）_表单特效

<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>随着输入文字的多少自动变化宽度的INPUT，带计数</title> <script language="javascript"> function checkLength(which) { var maxchar=20; var oTextCount = document.getElementById("char"); iCount = which.value.replace(/[^\u0000-\u00ff]/g,"aa").length; if(iCount<=maxchar) { oTextCount.innerHTML = "<font color=#FF0000>"+ iCount+""; which.style.border = '1px dotted #FF0000'; which.size=iCount+2; } else alert("请不要超过"+maxchar); } </script> <input name="words" size="2" maxlength="100" onkeyup="checkLength(this)"> <span id="char">0</span>个字符
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