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<!-- 本次作業(yè)再次完善了在線(xiàn)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(guò)if語(yǔ)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(guò)一個(gè)字符串?dāng)?shù)組預(yù)置一...
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<!DOCTYPE html><html><head><meta charset="UTF-8"><title>邊框&l...
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<html><head></head><body><div>有人說(shuō)，人生像一首詩(shī)，簡(jiǎn)潔空靈，卻意味深長(zhǎng);也有人說(shuō)，人生像一篇散文，優(yōu)美嫻靜，...
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<html> <head> <title> &...
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<!DOCTYPE html><html lang="en"><head> &...
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通過(guò)document.getelementbyid,document.getelementbytagname,document.getelementbyclassname，獲取到元素,并利用oncli...
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