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小(xiao)鋒  2023-05-22 14:12:33

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element.addEventListener(eventType, callback);

element.onclick = function() {
  // 處理(li)點擊事件的邏輯
};

element.onchange = function() {
  // 處理值改變(bian)事件的邏輯
};

window.onload = function() {
  // 頁面加(jia)載(zai)完成后的處理邏輯(ji)
};

element.dispatchEvent(event);

其他答案

• 匿(ni)名(ming)用戶  2023-05-22 14:12:33

  　　在 JavaScript 中，事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)觸(chu)(chu)發(fa)(fa)(fa)(fa)器(qi)通(tong)常指事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)對象或觸(chu)(chu)發(fa)(fa)(fa)(fa)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)方(fang)法(fa)。以下(xia)是(shi)一(yi)(yi)(yi)(yi)些(xie)常見的(de)(de)(de)(de)(de) JavaScript 事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)觸(chu)(chu)發(fa)(fa)(fa)(fa)器(qi)：1. 事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)對象(Event Object)：事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)對象是(shi)當事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)被觸(chu)(chu)發(fa)(fa)(fa)(fa)時(shi)(shi)(shi)傳(chuan)遞給(gei)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)處理程序(xu)的(de)(de)(de)(de)(de)參數。它(ta)包含(han)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)詳細信息(xi)，例如(ru)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)類型(xing)、觸(chu)(chu)發(fa)(fa)(fa)(fa)元素(su)、鼠標(biao)位置等。通(tong)過(guo)訪問事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)對象的(de)(de)(de)(de)(de)屬性和方(fang)法(fa)，你(ni)(ni)(ni)可(ke)以獲取(qu)有關事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)有用(yong)(yong)信息(xi)，例如(ru)停止事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)默認行(xing)為或阻止事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)傳(chuan)播。2. DOM 事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(DOM Event)：DOM 事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)是(shi)瀏(liu)覽器(qi)提(ti)供的(de)(de)(de)(de)(de)一(yi)(yi)(yi)(yi)種機制，用(yong)(yong)于管(guan)理 HTML 元素(su)的(de)(de)(de)(de)(de)交(jiao)互和響(xiang)應(ying)。當用(yong)(yong)戶(hu)與(yu)頁面(mian)交(jiao)互時(shi)(shi)(shi)(例如(ru)點擊、鼠標(biao)移(yi)動等)，瀏(liu)覽器(qi)將觸(chu)(chu)發(fa)(fa)(fa)(fa)相(xiang)應(ying)的(de)(de)(de)(de)(de) DOM 事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)。你(ni)(ni)(ni)可(ke)以使用(yong)(yong)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)監聽器(qi)(Event Listener)來響(xiang)應(ying)這些(xie)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)，并(bing)在事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)發(fa)(fa)(fa)(fa)生時(shi)(shi)(shi)執行(xing) JavaScript 代碼(ma)。3. 特殊(shu)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(Special Event)：特殊(shu)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)是(shi)由 JavaScript 框架、庫或插件(jian)(jian)(jian)(jian)(jian)(jian)(jian)定(ding)(ding)義的(de)(de)(de)(de)(de)一(yi)(yi)(yi)(yi)種事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)類型(xing)。例如(ru)，在 jQuery 中，'click'、'hover'、'keyup' 等事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)都是(shi)特殊(shu)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)，它(ta)們代表了一(yi)(yi)(yi)(yi)組相(xiang)關的(de)(de)(de)(de)(de)基本事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(例如(ru) 'mousedown'、'mousemove'、'mouseup' 組成了 'click' 事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian))，并(bing)提(ti)供了額外(wai)的(de)(de)(de)(de)(de)功能(neng)和語法(fa)糖。4. 自定(ding)(ding)義事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)(Custom Event)：自定(ding)(ding)義事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)是(shi)通(tong)過(guo)使用(yong)(yong) JavaScript 代碼(ma)創建的(de)(de)(de)(de)(de)一(yi)(yi)(yi)(yi)種事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)類型(xing)。你(ni)(ni)(ni)可(ke)以在任何時(shi)(shi)(shi)候觸(chu)(chu)發(fa)(fa)(fa)(fa)自定(ding)(ding)義事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)，并(bing)在事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)發(fa)(fa)(fa)(fa)生時(shi)(shi)(shi)執行(xing)相(xiang)應(ying)的(de)(de)(de)(de)(de) JavaScript 代碼(ma)。自定(ding)(ding)義事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)可(ke)以幫助(zhu)你(ni)(ni)(ni)輕松實現(xian)事(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)(jian)驅動的(de)(de)(de)(de)(de)編程模型(xing)，并(bing)更好地組織和管(guan)理你(ni)(ni)(ni)的(de)(de)(de)(de)(de)代碼(ma)。

• 匿(ni)名用戶(hu)  2023-05-22 14:12:33

  　　JavaScript事(shi)(shi)件(jian)觸發(fa)器(qi)是(shi)JavaScript編(bian)程(cheng)語言中的(de)(de)(de)重要組成(cheng)部分，它能夠幫助我們(men)實(shi)(shi)現在特(te)定情況下觸發(fa)特(te)定的(de)(de)(de)動作或函數。事(shi)(shi)件(jian)觸發(fa)器(qi)是(shi)基于(yu)事(shi)(shi)件(jian)驅(qu)動編(bian)程(cheng)范(fan)式實(shi)(shi)現的(de)(de)(de)，這意味著(zhu)當特(te)定的(de)(de)(de)事(shi)(shi)件(jian)發(fa)生時，它會自動觸發(fa)與之相(xiang)關的(de)(de)(de)代(dai)碼(ma)。例如，用戶單擊網頁上的(de)(de)(de)按鈕時，事(shi)(shi)件(jian)觸發(fa)器(qi)將開始(shi)執行與該(gai)按鈕相(xiang)關的(de)(de)(de)代(dai)碼(ma)。可(ke)以(yi)將事(shi)(shi)件(jian)觸發(fa)器(qi)視(shi)為一(yi)種(zhong)響應用戶操作的(de)(de)(de)機制。

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