<input value="51js.com" onclick="alert(this.createTextRange().boundingWidth);">
<input value="51js.com" style="width:185px; border:solid 1px #999999"
onpropertychange="this.style.posWidth=this.createTextRange().boundingWidth;">
<textarea id="neirong" name="neirong" style="width:185px;height:36px;overflow:hidden; border:solid 1px #999999" onpropertychange="if(this.scrollHeight>36){this.style.posHeight=this.scrollHeight}else{this.style.posHeight=36}"></textarea>
<input type="text" style="width: 50; overflow: visible">
<textarea id="neirong" name="neirong" style="width:185px;height:36px;overflow:hidden; border:solid 1px #999999;overflow: visible" ></textarea>