MouseEvent.clientX

MouseEvent.clientX 是只读属性, 它提供事件发生时的应用客户端区域的水平坐标 (与页面坐标不同)。例如,不论页面是否有水平滚动,当你点击客户端区域的左上角时,鼠标事件的 clientX 值都将为 0 。最初这个属性被定义为长整型(long integer),如今 CSSOM 视图模块将其重新定义为双精度浮点数(double float)。你可以查阅浏览器兼容性部分的文档来进一步了解有关信息。

语法


var x = instanceOfMouseEvent.clientX

返回值

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.

示例

<!DOCTYPE html> 
<html>
  <head>
    <title>clientX/clientY example</title>

    <script>
      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
clientX
Working Draft Redefines MouseEvent from long to double.
Document Object Model (DOM) Level 3 Events Specification
MouseEvent.clientX
Obsolete No change from Document Object Model (DOM) Level 2 Events Specification.
Document Object Model (DOM) Level 2 Events Specification
MouseEvent.clientX
Obsolete Initial definition.

浏览器兼容性

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
clientXChrome Full support YesEdge Full support 12Firefox Full support YesIE Full support 6Opera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes
Value type changed from long to doubleChrome Full support 56Edge ? Firefox ? IE ? Opera ? Safari ? WebView Android Full support 56Chrome Android Full support 56Firefox Android ? Opera Android ? Safari iOS ? Samsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

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