textarea高度自动增高

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随着textarea 输入内容 自动增加高度

<script type="text/javascript">

    $(".input_textarea").each(function(){

        this.style.height=this.scrollHeight+‘px‘;

    });

    $(".input_textarea").bind({

        input:function(){

            this.style.height=this.scrollHeight + ‘px‘;

        },

        propertychange:function(){

            this.style.height=this.scrollHeight + ‘px‘;

        }

    });

</script>