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<html> <head> <title>文本框宽度自动适应文本宽度</title> </head> <script type="text/javascript"> function changeInputlength(cursor) { var getcount=document.getElementById("countFont"); var getText=document.getElementById("text"); getcount.innerHTML='<font>第'+(parseInt(getText.value.length)+1)+'个字符</font>'; cursor.size=getText.value.length+2; } </script> <body> 请输入字符:<input type="text" size="3" id="text" οnkeydοwn="changeInputlength(this);"/> <span id="countFont"></span> </body> </html>