如何將onmousemove與onmousedown連接？

Question

我想按下鼠標按鈕並移動光標，以顯示按下按鈕時光標的坐標。 當我停止單擊時，它應該停止顯示坐標。

碼：

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Example</title>
  <style>
    body {
      height: 3000px;
    }
  </style>
</head>
<body>
<script>
  (function() {
    "use strict";

    document.onmousedown = handleMouseDown;
    function handleMouseDown(event) {
      console.log("down")
    }

    document.onmousemove = handleMouseMove;
    function handleMouseMove(event) {
      var dot, eventDoc, doc, body, pageX, pageY;

      event = event || window.event;
      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 );
      }
      console.log("left: " + event.pageX + "px -- right: " + event.pageY + "px");
    }
  })();
</script>
</body>
</html>

先感謝您。

Answer 1

只需在mousedown / mouseup事件發生時附加/分離mousemove處理功能：

 document.onmousedown = function () { document.onmousemove = handleMouseMove; }; document.onmouseup = function () { document.onmousemove = null; }; function handleMouseMove(event) { var dot, eventDoc, doc, body, pageX, pageY; event = event || window.event; 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 ); } console.log("left: " + event.pageX + "px -- right: " + event.pageY + "px"); }

如何將onmousemove與onmousedown連接？

問題描述

1 個解決方案

解決方案1
0 已采納 2018-02-21 10:58:00

如何將onmousemove與onmousedown連接？

問題描述

1 個解決方案

解決方案1 0 已采納 2018-02-21 10:58:00

解決方案1
0 已采納 2018-02-21 10:58:00