div模拟textarea文本域轻松实现高度自适应

<style>
	.textarea{
    	400px;
    	min-height:20px;
    	max-height:300px;
    	_height:120px;
    	margin: 0 auto;
	    padding:3px;
	    outline:0;
	    border:1px solid #a0b3d6;
	    font-size:12px;
	    line-height:24px;
	    word-wrap:break-word;
	    overflow-x:hidden;
	    overflow-y:auto;
	}

</style>

　　

<div class="textarea" contenteditable="true"></div>

　　http://www.xuanfengge.com/demo/201308/textarea/demo2.html