ajax簡單與ajax+php實例應(yīng)用(1/4)
Jun 08, 2016 pm 05:26 PM[ajax介紹]
ajax是使用客戶端腳本與web服務(wù)器交換數(shù)據(jù)的web應(yīng)用開發(fā)方法。web頁面不用打斷交互流程進行重新加裁,就可以動態(tài)地更新。使用ajax,用戶可以創(chuàng)建接近本地桌面應(yīng)用的直接、高可用、更豐富、更動態(tài)的web用戶界面。
異步網(wǎng)頁特效和xml(ajax)不是什么新技術(shù),而是使用幾種現(xiàn)有技術(shù)——包括級聯(lián)樣式表(css教程)、網(wǎng)頁特效、xhtml、xml和可擴展樣式語言轉(zhuǎn)換(xslt),開發(fā)外觀及操作類似桌面軟件的web應(yīng)用軟件。
[ajax執(zhí)行原理]
一個ajax交互從一個稱為xmlhttprequest的javascript對象開始。如同名字所暗示的,它允許一個客戶端腳本來執(zhí)行http請求,并且將會解析一個xml格式的服務(wù)器響應(yīng)。ajax處理過程中的第一步是創(chuàng)建一個xmlhttprequest實例。使用http方法(get或post)來處理請求,并將目標(biāo)url設(shè)置到xmlhttprequest對象上。
當(dāng)你發(fā)送http請求,你不希望瀏覽器掛起并等待服務(wù)器的響應(yīng),取而代之的是,你希望通過頁面繼續(xù)響應(yīng)用戶的界面交互,并在服務(wù)器響應(yīng)真正到達(dá)后處理它們。要完成它,你可以向xmlhttprequest注冊一個回調(diào)函數(shù),并異步地派發(fā)xmlhttprequest請求。控制權(quán)馬上就被返回到瀏覽器,當(dāng)服務(wù)器響應(yīng)到達(dá)時,回調(diào)函數(shù)將會被調(diào)用。

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