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小锋  2023-05-22 13:49:07

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element.addEventListener(event, function, useCapture);

element.removeEventListener(event, function, useCapture);

event.preventDefault();

event.stopPropagation();

event.target;

event.currentTarget;

event.keyCode; // 返回按下(xia)的(de)键的(de)键码
event.key; // 返(fan)回按(an)下的(de)键(jian)的(de)键(jian)名(ming)

event.preventDefault();

其他答案

• 匿名用户 2023-05-22 13:49:07 

  　　JavaScript 中常用(yong)的(de)(de)(de)(de)(de)(de)(de)(de)事(shi)(shi)(shi)件(jian)(jian)(jian)相(xiang)关(guan)方法包括：1. `addEventListener(event, callback, useCapture)`：向元(yuan)素添(tian)加事(shi)(shi)(shi)件(jian)(jian)(jian)监(jian)听(ting)器(qi)(qi)，用(yong)于(yu)捕获(huo)(huo)指定事(shi)(shi)(shi)件(jian)(jian)(jian)发生时的(de)(de)(de)(de)(de)(de)(de)(de)回调函数。2. `removeEventListener(event, callback, useCapture)`：从元(yuan)素中移除事(shi)(shi)(shi)件(jian)(jian)(jian)监(jian)听(ting)器(qi)(qi)。3. `preventDefault()`：阻止(zhi)事(shi)(shi)(shi)件(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)(de)(de)默认行(xing)为，例如阻止(zhi)表(biao)(biao)单(dan)提交或链接跳(tiao)转。4. `stopPropagation()`：停止(zhi)事(shi)(shi)(shi)件(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)(de)(de)传播，阻止(zhi)事(shi)(shi)(shi)件(jian)(jian)(jian)冒泡到父(fu)元(yuan)素或捕获(huo)(huo)到更上层的(de)(de)(de)(de)(de)(de)(de)(de)元(yuan)素。5. `target`：事(shi)(shi)(shi)件(jian)(jian)(jian)对(dui)象(xiang)的(de)(de)(de)(de)(de)(de)(de)(de)属(shu)性(xing)(xing)(xing)(xing)，表(biao)(biao)示触发事(shi)(shi)(shi)件(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)(de)(de)目标(biao)(biao)元(yuan)素。6. `currentTarget`：事(shi)(shi)(shi)件(jian)(jian)(jian)对(dui)象(xiang)的(de)(de)(de)(de)(de)(de)(de)(de)属(shu)性(xing)(xing)(xing)(xing)，表(biao)(biao)示当前(qian)正在处理事(shi)(shi)(shi)件(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)(de)(de)元(yuan)素。7. `event.type`：事(shi)(shi)(shi)件(jian)(jian)(jian)对(dui)象(xiang)的(de)(de)(de)(de)(de)(de)(de)(de)属(shu)性(xing)(xing)(xing)(xing)，表(biao)(biao)示事(shi)(shi)(shi)件(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)(de)(de)类型，如 "click"、"keyup" 等(deng)。8. `event.keyCode`：事(shi)(shi)(shi)件(jian)(jian)(jian)对(dui)象(xiang)的(de)(de)(de)(de)(de)(de)(de)(de)属(shu)性(xing)(xing)(xing)(xing)，在键(jian)盘事(shi)(shi)(shi)件(jian)(jian)(jian)中表(biao)(biao)示按下的(de)(de)(de)(de)(de)(de)(de)(de)键(jian)的(de)(de)(de)(de)(de)(de)(de)(de)键(jian)码(ma)值。9. `event.clientX` 和 `event.clientY`：事(shi)(shi)(shi)件(jian)(jian)(jian)对(dui)象(xiang)的(de)(de)(de)(de)(de)(de)(de)(de)属(shu)性(xing)(xing)(xing)(xing)，在鼠标(biao)(biao)事(shi)(shi)(shi)件(jian)(jian)(jian)中表(biao)(biao)示鼠标(biao)(biao)相(xiang)对(dui)于(yu)浏(liu)览器(qi)(qi)窗(chuang)口的(de)(de)(de)(de)(de)(de)(de)(de)水平和垂(chui)直坐标(biao)(biao)。10. `event.preventDefault()` 和 `event.stopPropagation()`：事(shi)(shi)(shi)件(jian)(jian)(jian)对(dui)象(xiang)的(de)(de)(de)(de)(de)(de)(de)(de)方法，与前(qian)面提到的(de)(de)(de)(de)(de)(de)(de)(de)方法功能(neng)相(xiang)同(tong)。这些方法和属(shu)性(xing)(xing)(xing)(xing)可以通过(guo)事(shi)(shi)(shi)件(jian)(jian)(jian)对(dui)象(xiang)来(lai)访问和使(shi)用(yong)，它们能(neng)够帮助您在 JavaScript 中对(dui)事(shi)(shi)(shi)件(jian)(jian)(jian)进行(xing)处理和控制。

• 匿名(ming)用(yong)户 2023-05-22 13:49:07  

  　　首先，我们(men)可(ke)(ke)以(yi)使用(yong)(yong)(yong)(yong) addEventListener 方(fang)法(fa)来为(wei)元(yuan)(yuan)素添(tian)(tian)加(jia)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)监(jian)听器(qi)(qi)(qi)。通过(guo)指定(ding)要监(jian)听的(de)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)类型和(he)相应(ying)的(de)回(hui)调函(han)数，我们(men)可(ke)(ke)以(yi)在特定(ding)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)发生时执行(xing)自定(ding)义的(de)代码(ma)。例(li)如，我们(men)可(ke)(ke)以(yi)使用(yong)(yong)(yong)(yong) addEventListener 方(fang)法(fa)为(wei)按(an)(an)(an)钮元(yuan)(yuan)素添(tian)(tian)加(jia)点击事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)监(jian)听器(qi)(qi)(qi)，当(dang)用(yong)(yong)(yong)(yong)户点击按(an)(an)(an)钮时，相应(ying)的(de)回(hui)调函(han)数将被触(chu)发。另(ling)一个(ge)(ge)常用(yong)(yong)(yong)(yong)的(de)方(fang)法(fa)是(shi) removeEventListener，它(ta)(ta)允许我们(men)从(cong)元(yuan)(yuan)素中移除特定(ding)的(de)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)监(jian)听器(qi)(qi)(qi)。这在我们(men)不再(zai)需要某个(ge)(ge)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)的(de)监(jian)听器(qi)(qi)(qi)时非常有(you)用(yong)(yong)(yong)(yong)，可(ke)(ke)以(yi)帮助我们(men)清(qing)理不需要的(de)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)处理程序(xu)，以(yi)避(bi)(bi)免(mian)可(ke)(ke)能的(de)内存(cun)泄漏。除了添(tian)(tian)加(jia)和(he)移除事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)监(jian)听器(qi)(qi)(qi)，JavaScript 还提(ti)供了其他(ta)一些常用(yong)(yong)(yong)(yong)的(de)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)相关方(fang)法(fa)。例(li)如，preventDefault 方(fang)法(fa)可(ke)(ke)以(yi)用(yong)(yong)(yong)(yong)来阻止(zhi)元(yuan)(yuan)素默认(ren)的(de)行(xing)为(wei)，例(li)如阻止(zhi)表单(dan)提(ti)交(jiao)(jiao)或超链接跳转。这对于实(shi)现(xian)自定(ding)义的(de)交(jiao)(jiao)互(hu)行(xing)为(wei)非常有(you)用(yong)(yong)(yong)(yong)。另(ling)一个(ge)(ge)常见的(de)方(fang)法(fa)是(shi) stopPropagation，它(ta)(ta)可(ke)(ke)以(yi)阻止(zhi)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)冒(mao)泡(pao)。事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)冒(mao)泡(pao)是(shi)指当(dang)一个(ge)(ge)元(yuan)(yuan)素触(chu)发某个(ge)(ge)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)时，它(ta)(ta)的(de)父(fu)(fu)级(ji)(ji)元(yuan)(yuan)素也(ye)会收到(dao)该(gai)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)的(de)通知(zhi)。通过(guo)调用(yong)(yong)(yong)(yong) stopPropagation 方(fang)法(fa)，我们(men)可(ke)(ke)以(yi)阻止(zhi)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)继续向父(fu)(fu)级(ji)(ji)元(yuan)(yuan)素传播(bo)，从(cong)而避(bi)(bi)免(mian)触(chu)发不必要的(de)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)处理程序(xu)。此外(wai)，JavaScript 还提(ti)供了一些其他(ta)常用(yong)(yong)(yong)(yong)的(de)事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)方(fang)法(fa)，例(li)如 target 属(shu)性可(ke)(ke)以(yi)用(yong)(yong)(yong)(yong)来获取(qu)触(chu)发事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)的(de)元(yuan)(yuan)素，keyCode 属(shu)性可(ke)(ke)以(yi)获取(qu)按(an)(an)(an)下的(de)键盘键的(de)代码(ma)等等。这些方(fang)法(fa)和(he)属(shu)性可(ke)(ke)以(yi)帮助我们(men)更好地处理事(shi)(shi)(shi)(shi)件(jian)(jian)(jian)(jian)(jian)(jian)，并实(shi)现(xian)更丰富的(de)交(jiao)(jiao)互(hu)体验。

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