JS實現滑鼠按下拖拽效果
阿新 • • 發佈：2020-07-24
原生JS實現滑鼠按下拖拽效果，供大家參考，具體內容如下
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>滑鼠拖動</title>
<style type="text/css">
body {
margin: 0;
}
div {
width: 200px;
height: 200px;
position: absolute;
background-color: pink;
}
</style>
</head>
<body>
<div onmousedown="downDiv(this)" onmousemove="moveDiv(this)" onmouseup="upDiv(this)">
</div>
<script>
//定義變數儲存div的寬高
var obj_w,obj_h;
//定義一個變數判斷是否執行移動函式
var mouseDown = false;
//滑鼠按下函式
function downDiv(obj) {
//獲取div的寬高
obj_w = obj.offsetWidth;
obj_h = obj.offsetHeight;
//滑鼠
var e = event || window.event;
//e.clientX/Y 是獲取滑鼠相對瀏覽器的位置；將div中心自動居中到滑鼠
obj.style.left = (e.clientX - obj_w / 2) + "px";
obj.style.top = (e.clientY - obj_h / 2) + "px";
console.log(obj.style.left,obj.style.top)
//按下時為ture,鬆開時為false，以判斷是否執行執行mouveDiv
mouseDown = true;
}
//滑鼠移動函式
function moveDiv(obj) {
obj_w = obj.offsetWidth;
obj_h = obj.offsetHeight;
var e = event || window.event;
console.log(e.clientX,e.clientY);
console.log(obj_w,obj_h);
if (mouseDown) {
obj.style.left = (e.clientX - obj_w / 2) + "px";
obj.style.top = (e.clientY - obj_h / 2) + "px";
console.log(obj.style.left,obj.style.top)
}
}
//滑鼠鬆開函式
function upDiv(obj) {
mouseDown = false;
}
</script>
</body>
</html>更多精彩文章請點選專題： Javascript拖拽特效彙總
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