Learn about the EventTarget.addEventListener() method, including its syntax, code examples, specifications, and browser compatibility.
Learn about the EventTarget.addEventListener() method, including its syntax, code examples, specifications, and browser compatibility.
Learn about the EventTarget.addEventListener() method, including its syntax, code examples, specifications, and browser compatibility.
The addEventListener() method of the EventTarget interface sets up a function that will be called whenever the specified event is delivered to the target.
addEventListener("click", bluify, false); } 内联事件处理器中的 this 当代码从内联事件处理器属性调用时,它的 this 绑定到放置监听器的 DOM 元素上: htmlCopy to Clipboard Show this 上面的 alert 会显示 button。注意只有外层代码中的 this 是这样设置的: htmlCopy to Clipboard Show inner this 在...
jsCopy to Clipboard // 代替 setTimeout(" ... ", 1000) 写法: setTimeout(function() { ... }, 1000); // 代替 elt.setAttribute("onclick", "...") 写法: elt.addEventListener('click', function() { ... } , false); 闭包 也有助于创建参数化函数而不用连接字符串。
当使用addEventListener()为一个元素注册事件的时候,句柄里的 this 值是该元素的引用。其与传递给句柄的 event 参数的currentTarget 属性的值一样。 If an event attribute (e.g.,onclick) is specified on an element in the HTML source, the JavaScript code in the attribute value is effectively wrapped in...
(charCode != 0) { if (charCode < 97 || charCode > 122) { evt.preventDefault(); alert("只能输入小写字母." + "\n" + "charCode: " + charCode + "\n" ); } } } document.getElementById('my-textbox').addEventListener( 'keypress', checkName, false ); 备注 在事件触发后的任何...
div.addEventListener('click', function () { console.log('capture', 'div'); }, true); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 以上是一段很简单的事件注册的代码,然后我们点击 button。 先不看结果...
elem.addEventListener( "build", (e) => { // e.target matches elem }, false, ); // Target can be any Element or other EventTarget. elem.dispatchEvent(event); Notes Event type strings suitable for passing to createEvent() are listed in the DOM standard — see the table in step 2....