MouseEvent.clientY

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。

语法

var y = instanceOfMouseEvent.clientY

Return value

被 CSSOM View Module 重新定义为一个 double 类型的浮点值. 原来这个属性是被定义为一个 long 整数. 可以在 "浏览器兼容性" 那里查看详细内容.

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>

规范

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.

浏览器兼容性

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