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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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總結(jié)：--------------------------------------------------------使用id屬性獲取元素id屬性需要在Document文檔節(jié)點(diǎn)對(duì)象中引用語(yǔ)法：docu...
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<script type="text/javascript"> //獲取到頁(yè)面中的按鈕,文本域,對(duì)話(huà)內(nèi)容區(qū) let btn = document.getElemen...
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<script type="text/javascript"> //獲取到頁(yè)面中的按鈕,文本域,對(duì)話(huà)內(nèi)容區(qū) let btn = document.getElemen...
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