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<!-- 本次作業(yè)再次完善了在線客服聊天系統(tǒng)。主要增加了，1、禁止發(fā)送空消息功能（直接通過if語句判斷Input.value是否為空）；2、在消息內(nèi)容前面增加了頭像；3、通過一個字符串數(shù)組預(yù)置一...
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<html><head></head><body><div>有人說，人生像一首詩，簡潔空靈，卻意味深長;也有人說，人生像一篇散文，優(yōu)美嫻靜，...
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通過document.getelementbyid,document.getelementbytagname,document.getelementbyclassname，獲取到元素,并利用oncli...
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