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<!-- 本次作业再次完善了在线客服聊天系统。主要增加了，1、禁止发送空消息功能（直接通过if语句判断Input.value是否为空）；2、在消息内容前面增加了头像；3、通过一个字符串数组预置一...
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总结：--------------------------------------------------------使用id属性获取元素id属性需要在Document文档节点对象中引用语法：docu...
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<script type="text/javascript"> //获取到页面中的按钮,文本域,对话内容区 let btn = document.getElemen...
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<script type="text/javascript"> //获取到页面中的按钮,文本域,对话内容区 let btn = document.getElemen...
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