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小鋒 2023-05-22 14:19:26

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element.addEventListener(eventType, callback);

<button onclick="myFunction()">Click me</button>

element.onclick = function() {
  // 處理點擊事件(jian)的邏(luo)輯(ji)
};

parentElement.addEventListener(eventType, function(event) {
  if (event.target.matches('.child-element')) {
    // 處(chu)理子元(yuan)素觸發的(de)事件
  }
});

其他答案

• 匿(ni)名(ming)用戶(hu)  2023-05-22 14:19:26

  　　在JavaScript中，我(wo)們可(ke)以(yi)使(shi)(shi)用事(shi)(shi)件(jian)(jian)監(jian)(jian)聽(ting)(ting)器(qi)(qi)來(lai)(lai)監(jian)(jian)聽(ting)(ting)特定的(de)事(shi)(shi)件(jian)(jian)并執(zhi)行相(xiang)應的(de)操作。以(yi)下是JavaScript中的(de)事(shi)(shi)件(jian)(jian)監(jian)(jian)聽(ting)(ting)器(qi)(qi)：1. 元素事(shi)(shi)件(jian)(jian)監(jian)(jian)聽(ting)(ting)器(qi)(qi)(Element Event Listener)：為(wei)(wei)元素添(tian)加(jia)事(shi)(shi)件(jian)(jian)監(jian)(jian)聽(ting)(ting)器(qi)(qi)(例如(ru)click、mouseover和keypress等)，當元素觸(chu)發該(gai)事(shi)(shi)件(jian)(jian)時，監(jian)(jian)聽(ting)(ting)器(qi)(qi)將執(zhi)行相(xiang)應的(de)代碼(ma)。這(zhe)通常通過為(wei)(wei)元素對象添(tian)加(jia)特定的(de)屬(shu)性(xing)(xing)(例如(ru)onclick和onmouseover)來(lai)(lai)完成。2. 事(shi)(shi)件(jian)(jian)監(jian)(jian)聽(ting)(ting)器(qi)(qi)方(fang)法(Event Listener Method)：使(shi)(shi)用addEventListener()和removeEventListener()方(fang)法來(lai)(lai)添(tian)加(jia)和刪(shan)除事(shi)(shi)件(jian)(jian)監(jian)(jian)聽(ting)(ting)器(qi)(qi)。這(zhe)種方(fang)法可(ke)以(yi)在同一(yi)個元素上為(wei)(wei)多個事(shi)(shi)件(jian)(jian)添(tian)加(jia)監(jian)(jian)聽(ting)(ting)器(qi)(qi)，并可(ke)以(yi)輕松地刪(shan)除已添(tian)加(jia)的(de)監(jian)(jian)聽(ting)(ting)器(qi)(qi)，具有更好的(de)靈活性(xing)(xing)和可(ke)維護性(xing)(xing)。3. 事(shi)(shi)件(jian)(jian)委托(tuo)(Event Delegation)：使(shi)(shi)用事(shi)(shi)件(jian)(jian)委托(tuo)可(ke)以(yi)將事(shi)(shi)件(jian)(jian)監(jian)(jian)聽(ting)(ting)器(qi)(qi)添(tian)加(jia)到元素的(de)父(fu)元素上，而不(bu)是每個子(zi)元素上。這(zhe)種技(ji)術可(ke)以(yi)減(jian)少代碼(ma)的(de)復雜性(xing)(xing)，提(ti)高代碼(ma)的(de)重用性(xing)(xing)和性(xing)(xing)能(neng)。

• 匿名用(yong)戶  2023-05-22 14:19:26

  　　在 JavaScript 中，可以(yi)通(tong)(tong)過事(shi)(shi)件(jian)(jian)(jian)(jian)監(jian)(jian)(jian)聽(ting)(ting)(ting)來捕獲和處理(li)特定(ding)(ding)(ding)的事(shi)(shi)件(jian)(jian)(jian)(jian)。以(yi)下是幾(ji)種(zhong)常見的 JavaScript 事(shi)(shi)件(jian)(jian)(jian)(jian)監(jian)(jian)(jian)聽(ting)(ting)(ting)方(fang)(fang)(fang)(fang)式：1. 使用 `addEventListener` 方(fang)(fang)(fang)(fang)法(fa)：這種(zhong)方(fang)(fang)(fang)(fang)式可以(yi)在指(zhi)定(ding)(ding)(ding)元素(su)上添(tian)加事(shi)(shi)件(jian)(jian)(jian)(jian)監(jian)(jian)(jian)聽(ting)(ting)(ting)器，監(jian)(jian)(jian)聽(ting)(ting)(ting)指(zhi)定(ding)(ding)(ding)的事(shi)(shi)件(jian)(jian)(jian)(jian)類型(xing)，并在事(shi)(shi)件(jian)(jian)(jian)(jian)觸發時(shi)執行相(xiang)應(ying)(ying)的回(hui)調函(han)數(shu)(shu)。2. 直接(jie)賦值事(shi)(shi)件(jian)(jian)(jian)(jian)處理(li)函(han)數(shu)(shu)：這種(zhong)方(fang)(fang)(fang)(fang)式將函(han)數(shu)(shu)直接(jie)賦值給元素(su)的事(shi)(shi)件(jian)(jian)(jian)(jian)屬性，當事(shi)(shi)件(jian)(jian)(jian)(jian)觸發時(shi)，相(xiang)應(ying)(ying)的函(han)數(shu)(shu)會(hui)被(bei)調用。3. 使用 HTML 屬性：這種(zhong)方(fang)(fang)(fang)(fang)式是在 HTML 元素(su)上直接(jie)指(zhi)定(ding)(ding)(ding)事(shi)(shi)件(jian)(jian)(jian)(jian)處理(li)函(han)數(shu)(shu)，在事(shi)(shi)件(jian)(jian)(jian)(jian)觸發時(shi)執行對應(ying)(ying)的函(han)數(shu)(shu)。無論是哪(na)種(zhong)方(fang)(fang)(fang)(fang)式，事(shi)(shi)件(jian)(jian)(jian)(jian)監(jian)(jian)(jian)聽(ting)(ting)(ting)的核心(xin)思想是通(tong)(tong)過指(zhi)定(ding)(ding)(ding)事(shi)(shi)件(jian)(jian)(jian)(jian)類型(xing)和事(shi)(shi)件(jian)(jian)(jian)(jian)處理(li)函(han)數(shu)(shu)，來建立事(shi)(shi)件(jian)(jian)(jian)(jian)與(yu)處理(li)邏輯之(zhi)間的關聯。當指(zhi)定(ding)(ding)(ding)的事(shi)(shi)件(jian)(jian)(jian)(jian)觸發時(shi)，相(xiang)應(ying)(ying)的事(shi)(shi)件(jian)(jian)(jian)(jian)處理(li)函(han)數(shu)(shu)就(jiu)會(hui)被(bei)調用，從而實現(xian)對事(shi)(shi)件(jian)(jian)(jian)(jian)的監(jian)(jian)(jian)聽(ting)(ting)(ting)和響應(ying)(ying)。

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