<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JavaScript實現元素拖動</title>
<style>
*{
margin: 0;
}
#app{
width: 100vw;
height: 100vh;
background: #9acfea;
position: relative;
}
#content{
width: 100px;
height: 100px;
position: fixed;
background: #ff6700;
border-radius: 10px;
cursor: pointer;
}
</style>
</head>
<body>
<div id="app">
<div id="content" data-type="0"></div>
</div>
<script type="text/javascript">
let content = document.getElementById("content");
window.onmousedown = function (ev) {
/*
* 獲取當前鼠標左鍵位置元素
* */
let ele = document.elementFromPoint(ev.clientX,ev.clientY);
/*
* 如果該位置元素屬性data-type值爲1則將該元素設爲選中態
* */
if (ev.buttons===1 && ele.dataset.type==="0"){
ele.dataset.selected = true;
content.dataset.x = ev.layerX.toString();
content.dataset.y = ev.layerY.toString();
}
};
window.onmousemove = function (ev) {
/*
* 如果有選中態元素存在，移動選中態的元素
* */
if (content.dataset.selected === "true") {
let pad_x = Number.parseInt(content.dataset.x);
let pad_y = Number.parseInt(content.dataset.y);
let flag = ev.clientX>pad_x &&
ev.clientX<window.innerWidth+pad_x-100 &&
ev.clientY>pad_y &&
ev.clientY<window.innerHeight+pad_y-100;
if (flag){
content.style.marginLeft = ev.clientX-pad_x+'px';
content.style.marginTop = ev.clientY-pad_y+'px';
}
}
};
window.onmouseup = function (ev) {
/*
* 鼠標左鍵彈起後如果有選中態元素，將它設爲未選中態
* */
if (content.dataset.selected = true) {
content.dataset.selected = false;
}
}
</script>
</body>
</html>
JavaScript - 元素拖動
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