jq 构造函数，然后再表单提交进程中对数据进行修改

		<script type="text/javascript">					function appendText(){							    var content = $("#textarea").val();			    			    var new_content = content + "wap";			    			    $("#textarea").attr("value",new_content);			};					</script>

<form onsubmit="appendText();" >