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HTML onchange 属性


定义和用法

当元素的值发生变化时,onchange 属性会触发。

提示:此事件类似于 oninput 事件。区别在于 oninput 事件在元素的值发生变化后立即发生,而 onchange 事件在元素失去焦点时发生。另一个区别是,onchange 事件也适用于 <select> 元素。


应用于

onchange 属性是 事件属性 的一部分,可以用于任何 HTML 元素。

元素 事件
所有 HTML 元素 onchange

示例

选择示例

当用户更改 <select> 元素的所选选项时,执行 JavaScript

<select onchange="myFunction()">
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输入示例

当用户更改输入字段的内容时,执行 JavaScript

<input type="text" name="txt" value="Hello" onchange="myFunction(this.value)">
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浏览器支持

事件属性
onchange

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