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MouseEvent.clientY 是只读属性， 它提供事件发生时的应用客户端区域的垂直坐标 (与页面坐标不同)。例如，当你点击客户端区域的左上角时，鼠标事件的 clientY 值为 0 ，这一值与页面是否有垂直滚动无关。
Syntax
var y = instanceOfMouseEvent.clientY
Return value
一个number类型
Example
<html>
<head>
<title>clientX\clientY example</title>
<script type="text/javascript">
function showCoords(evt){
alert(
"clientX value: " + evt.clientX + "\n"
+ "clientY value: " + evt.clientY + "\n"
);
}
</script>
</head>
<body onmousedown="showCoords(event)">
<p>To display the mouse coordinates click anywhere on the page.</p>
</body>
</html>
Specifications
| Specification | Status | Comment |
|---|---|---|
| CSS Object Model (CSSOM) View Module clientY |
Working Draft | Redefines MouseEvent from long to double. |
| Document Object Model (DOM) Level 3 Events Specification MouseEvent.clientY |
Obsolete | No change from Document Object Model (DOM) Level 2 Events Specification. |
| Document Object Model (DOM) Level 2 Events Specification MouseEvent.clientY |
Obsolete | Initial definition. |
Browser compatibility
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | 6 | (Yes) | (Yes) |
Redefined from long to double |
56 | ? | ? | ? | ? | ? |
| Feature | Android Webview | Chrome for Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | ? | ? | ? | ? |
Redefined from long to double |
56 | 56 | ? | ? | ? | ? | ? |