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小鋒 2023-05-22 13:38:00 

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• 匿名用(yong)戶  2023-05-22 13:38:00

  　　JavaScript 事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)機(ji)制是指當(dang)一(yi)個(ge)(ge)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)發(fa)(fa)(fa)生(sheng)時(shi)，瀏(liu)覽(lan)器(qi)(qi)如(ru)何去(qu)觸發(fa)(fa)(fa)并(bing)處理(li)(li)(li)相關的(de)(de)(de)(de)代碼。具(ju)體來(lai)說，JavaScript 事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)機(ji)制包括(kuo)以(yi)下幾個(ge)(ge)部分：1. 事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)綁定：通(tong)過添加事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)監聽器(qi)(qi)，將事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)與相應(ying)的(de)(de)(de)(de)代碼關聯(lian)起(qi)來(lai)。2. 事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)冒(mao)泡(pao)(pao)：當(dang)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)發(fa)(fa)(fa)生(sheng)時(shi)，先觸發(fa)(fa)(fa)最(zui)(zui)內(nei)(nei)層(ceng)(ceng)(ceng)(ceng)的(de)(de)(de)(de)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)，然后逐層(ceng)(ceng)(ceng)(ceng)向(xiang)外層(ceng)(ceng)(ceng)(ceng)冒(mao)泡(pao)(pao)，直(zhi)到(dao)達(da)到(dao)最(zui)(zui)外層(ceng)(ceng)(ceng)(ceng)的(de)(de)(de)(de)容器(qi)(qi)或文檔對(dui)(dui)(dui)象。3. 事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)捕獲：與事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)冒(mao)泡(pao)(pao)相反，事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)從外層(ceng)(ceng)(ceng)(ceng)容器(qi)(qi)開始被觸發(fa)(fa)(fa)，然后逐層(ceng)(ceng)(ceng)(ceng)向(xiang)內(nei)(nei)層(ceng)(ceng)(ceng)(ceng)捕獲，直(zhi)到(dao)達(da)到(dao)最(zui)(zui)內(nei)(nei)層(ceng)(ceng)(ceng)(ceng)的(de)(de)(de)(de)元素。4. 事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)處理(li)(li)(li)器(qi)(qi)：通(tong)過事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)監聽器(qi)(qi)綁定的(de)(de)(de)(de)函數，用于處理(li)(li)(li)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)發(fa)(fa)(fa)生(sheng)時(shi)的(de)(de)(de)(de)響應(ying)操作。5. 事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)對(dui)(dui)(dui)象：每個(ge)(ge)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)都對(dui)(dui)(dui)應(ying)一(yi)個(ge)(ge)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)對(dui)(dui)(dui)象，可(ke)以(yi)通(tong)過事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)對(dui)(dui)(dui)象的(de)(de)(de)(de)屬性和方法獲取事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)的(de)(de)(de)(de)詳(xiang)細信息。6. 默(mo)認行為(wei)：默(mo)認情況下，某些(xie)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)會(hui)觸發(fa)(fa)(fa)瀏(liu)覽(lan)器(qi)(qi)的(de)(de)(de)(de)默(mo)認行為(wei)，如(ru)鏈接被點擊時(shi)跳轉到(dao)對(dui)(dui)(dui)應(ying)的(de)(de)(de)(de)頁面，這些(xie)默(mo)認行為(wei)可(ke)以(yi)通(tong)過阻(zu)止事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)的(de)(de)(de)(de)傳(chuan)播和默(mo)認行為(wei)來(lai)禁止或修改。JavaScript 事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)機(ji)制是實現交互性和動態化的(de)(de)(de)(de)重要基礎，熟悉它能夠幫助開發(fa)(fa)(fa)者(zhe)更好的(de)(de)(de)(de)處理(li)(li)(li)和管理(li)(li)(li)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)。

• 匿名用戶(hu) 2023-05-22 13:38:00

  　　Javascript中(zhong)(zhong)(zhong)的(de)(de)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)處(chu)理程(cheng)序(xu)是(shi)指(zhi)在(zai)(zai)發生(sheng)(sheng)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)時執行的(de)(de)代碼。事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)處(chu)理程(cheng)序(xu)可(ke)以(yi)(yi)是(shi)內(nei)聯代碼、函數(shu)引用(yong)或匿(ni)名函數(shu)。當事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)發生(sheng)(sheng)時，事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)處(chu)理程(cheng)序(xu)將被調用(yong)并傳遞事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)對象作為參數(shu)，以(yi)(yi)便處(chu)理程(cheng)序(xu)可(ke)以(yi)(yi)訪(fang)問事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)的(de)(de)屬(shu)性和方法。例如，在(zai)(zai)鼠標單擊(ji)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)中(zhong)(zhong)(zhong)，事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)對象包含有(you)關單擊(ji)位置和鼠標按鈕的(de)(de)信息。Javascript的(de)(de)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)模(mo)型還支(zhi)持事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)冒(mao)泡和事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)捕(bu)(bu)獲(huo)。事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)冒(mao)泡是(shi)指(zhi)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)從(cong)最內(nei)層元(yuan)(yuan)(yuan)(yuan)素傳播(bo)(bo)到最外層元(yuan)(yuan)(yuan)(yuan)素的(de)(de)過程(cheng)，而事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)捕(bu)(bu)獲(huo)則正好相反，從(cong)最外層元(yuan)(yuan)(yuan)(yuan)素向內(nei)層元(yuan)(yuan)(yuan)(yuan)素傳播(bo)(bo)。在(zai)(zai)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)冒(mao)泡模(mo)型中(zhong)(zhong)(zhong)，當事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)在(zai)(zai)元(yuan)(yuan)(yuan)(yuan)素上(shang)觸發時，它(ta)將向父元(yuan)(yuan)(yuan)(yuan)素傳播(bo)(bo)，直到傳播(bo)(bo)到文(wen)檔的(de)(de)根(gen)元(yuan)(yuan)(yuan)(yuan)素。在(zai)(zai)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)捕(bu)(bu)獲(huo)模(mo)型中(zhong)(zhong)(zhong)，事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)是(shi)從(cong)根(gen)元(yuan)(yuan)(yuan)(yuan)素開始傳播(bo)(bo)，直到觸發事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)的(de)(de)元(yuan)(yuan)(yuan)(yuan)素。為了(le)管理事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)處(chu)理程(cheng)序(xu)，Javascript提供(gong)了(le)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)監(jian)聽器。事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)監(jian)聽器是(shi)一種函數(shu)，可(ke)以(yi)(yi)在(zai)(zai)特定元(yuan)(yuan)(yuan)(yuan)素上(shang)注冊。當事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)發生(sheng)(sheng)時，事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)監(jian)聽器將被調用(yong)。

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