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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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<html><head></head><body><div>有人说，人生像一首诗，简洁空灵，却意味深长;也有人说，人生像一篇散文，优美娴静，...
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<html> <head> <title> &...
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<!DOCTYPE html><html lang="en"><head> &...
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通过document.getelementbyid,document.getelementbytagname,document.getelementbyclassname，获取到元素,并利用oncli...
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