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onchange事件有什么用

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Release: 2020-09-04 17:26:58
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onchange事件有什么用

onchange 事件怎么用?

定义和用法

onchange 事件会在域的内容改变时发生。

onchange 事件也可用于单选框与复选框改变后触发的事件。

语法

HTML 中:

<element onchange="SomeJavaScriptCode">
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JavaScript 中:

object.onchange=function(){SomeJavaScriptCode};
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参数

SomeJavaScriptCode 必需。规定该事件发生时执行的 JavaScript。

实例

当用户改变input输入框内容时执行一段Javascript代码:

<input type="text" onchange="myFunction()">
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