js代码

<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript" src="js/amazeui.min.js"></script>
<script type="text/javascript" src="js/zUI.js"></script>
<script type="text/javascript" src="js/wechat.js"></script>
<script type="text/javascript">
		//三图标
		window.onload=function(){
			function a(){
				var si1 = document.getElementById('si_1');
				var si2 = document.getElementById('si_2');
				var si3 = document.getElementById('si_3');
				si1.onclick=function(){
					si1.style.background="url(images/icon/head_2_1.png) no-repeat"
					si2.style.background="";
					si3.style.background="";
				};
				si2.onclick=function(){
					si2.style.background="url(images/icon/head_3_1.png) no-repeat"
					si1.style.background="";
					si3.style.background="";
				};
				si3.onclick=function(){
					si3.style.background="url(images/icon/head_4_1.png) no-repeat"
					si1.style.background="";
					si2.style.background="";
				};
			};
			function b(){
				var text = document.getElementById('input_box');
				var chat = document.getElementById('chatbox');
				var btn = document.getElementById('send');
				var talk = document.getElementById('talkbox');
				btn.onclick=function(){
					if(text.value ==''){
			            alert('不能发送空消息');
			        }else{
						chat.innerHTML += '<li class="me"><img src="'+'images/own_head.jpg'+'"><span>'+text.value+'</span></li>';
						text.value = '';
						chat.scrollTop=chat.scrollHeight;
						talk.style.background="#fff";
						text.style.background="#fff";
					};
				};
			};
			a();
			b();
		};
</script>