Javascript-跟踪鼠标位置

Z时代
2024-01-10
分类：问答

我希望每t毫秒定期跟踪一次鼠标光标的位置。因此，从本质上讲，当页面加载时-

该跟踪器应该启动，并且每（例如）每100毫秒启动一次，我应该获取posX和posY的新值并以表格形式打印出来。

我尝试了以下代码-但值没有刷新-表单框中仅显示posX和posY的初始值。关于如何启动和运行它的任何想法？

<html>
<head>
<title> Track Mouse </title>
<script type="text/javascript">
function mouse_position()
{
    var e = window.event;
    var posX = e.clientX;
    var posY = e.clientY;
    document.Form1.posx.value = posX;
    document.Form1.posy.value = posY;
    var t = setTimeout(mouse_position,100);
}
</script>
</head>
<body onload="mouse_position()">
<form name="Form1">
POSX: <input type="text" name="posx"><br>
POSY: <input type="text" name="posy"><br>
</form>
</body>
</html>

回答：

event在mousemove事件处理程序接收到的对象上报告鼠标的位置，您可以将其附加到窗口（事件冒泡）：

(function() {
    document.onmousemove = handleMouseMove;
    function handleMouseMove(event) {
        var eventDoc, doc, body;
        event = event || window.event; // IE-ism
        // If pageX/Y aren't available and clientX/Y are,
        // calculate pageX/Y - logic taken from jQuery.
        // (This is to support old IE)
        if (event.pageX == null && event.clientX != null) {
            eventDoc = (event.target && event.target.ownerDocument) || document;
            doc = eventDoc.documentElement;
            body = eventDoc.body;
            event.pageX = event.clientX +
              (doc && doc.scrollLeft || body && body.scrollLeft || 0) -
              (doc && doc.clientLeft || body && body.clientLeft || 0);
            event.pageY = event.clientY +
              (doc && doc.scrollTop  || body && body.scrollTop  || 0) -
              (doc && doc.clientTop  || body && body.clientTop  || 0 );
        }
        // Use event.pageX / event.pageY here
    }
})();

（请注意，它的主体if只能在旧版IE上运行。）

以上示例的实际操作在将鼠标拖动到页面上方时会绘制点。（在IE8，IE11，Firefox30，Chrome38上进行了测试。）

如果您确实需要基于计时器的解决方案，请将其与一些状态变量结合使用：

(function() {
    var mousePos;
    document.onmousemove = handleMouseMove;
    setInterval(getMousePosition, 100); // setInterval repeats every X ms
    function handleMouseMove(event) {
        var dot, eventDoc, doc, body, pageX, pageY;
        event = event || window.event; // IE-ism
        // If pageX/Y aren't available and clientX/Y are,
        // calculate pageX/Y - logic taken from jQuery.
        // (This is to support old IE)
        if (event.pageX == null && event.clientX != null) {
            eventDoc = (event.target && event.target.ownerDocument) || document;
            doc = eventDoc.documentElement;
            body = eventDoc.body;
            event.pageX = event.clientX +
              (doc && doc.scrollLeft || body && body.scrollLeft || 0) -
              (doc && doc.clientLeft || body && body.clientLeft || 0);
            event.pageY = event.clientY +
              (doc && doc.scrollTop  || body && body.scrollTop  || 0) -
              (doc && doc.clientTop  || body && body.clientTop  || 0 );
        }
        mousePos = {
            x: event.pageX,
            y: event.pageY
        };
    }
    function getMousePosition() {
        var pos = mousePos;
        if (!pos) {
            // We haven't seen any movement yet
        }
        else {
            // Use pos.x and pos.y
        }
    }
})();