實例如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>無標題文檔</title> <script language="javascript"> function checkLength(which) { var oTextCount = document.getElementById("char"); iCount = which.value.replace(/[^/u0000-/u00ff]/g,"aa"); oTextCount.innerHTML = "<font color=#FF0000>"+ iCount.length+"</font>"; which.style.border = '1px dotted #FF0000'; which.size=iCount.length+2; } </script> </head> <body> <input name="words" size="2" onkeyup="checkLength(this)"/> <span id="char">0</span>個字符 </body> </html>以上這篇Input文本框隨著輸入內容多少自動延伸的實現就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持武林網。
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