拿到了img的src值，
第三个是点击事件，
img的src赋值失败
该怎么把了
//这是文字点击发送事件
document.getElementById('send').addEventListener('tap',function(){
//拿到文本框里的内容
var msgInout = document.getElementById('msg-input');
var msgValue = msgInout.value;
var willSendMsg = '<div class="chat-box chat-box-right mui-content-padded">'+
'<img class="chat-avatar" src="../../img/y3.png"/>'+
'<div class="chat-content">'+
'<div class="chat-content-inner">' +
msgValue+
'</div>'+
'<div class="chat-content-arrow"></div>'+
'</div>'+
'<div class=".clear_float"></div>'+
'</div>';
var newDom = document.createElement('div');
newDom.innerHTML = willSendMsg;
var msgList = document.querySelector('.chat-list');
//把拼接好的气泡html追加到消息列表末尾
msgList.appendChild(newDom);
//清空文本框
msgInout.value = '';
//发送完成后隐藏发送按钮
sendButton.style.display = '';
emoticons.style.display = '';
msgList.scrollTop = msgList.scrollHeight - msgList.offsetHeight;
});
