<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>class</title>
<style type="text/css">
.d{
position: absolute;
width: 100px;
height: 100px;
background-color: #c00;
}
.a{
position: absolute;
width: 200px;
height: 100px;
background-color: #B5905F;
}
</style>
</head>
<body>
<div class="d">
</div>
<div class="a">
</div>
<script type="text/javascript">
class Drag {
constructor(op){
this.op = op;
this.l = null;
this.t = null;
this.mouseDowm = false;
}
toDrag(){
this.op.addEventListener("mousedown", event => {
this.mouseDowm = true;
let e = event || window.event;
this.l = e.pageX - this.op.offsetLeft;
this.t = e.pageY - this.op.offsetTop;
})
document.addEventListener("mousemove", event => {
console.log('this.mouseDowm',this.mouseDowm)
if(this.mouseDowm){
let cHeight = document.documentElement.clientHeight || document.body.clientHeight || window.innerHeight;
let cWidth = document.documentElement.clientWidth || document.body.clientWidth || window.innerWidth;
let e = event || window.event;
let moveLeft = e.clientX - this.l;
let moveTop = e.clientY - this.t
if(moveLeft < 0){
moveLeft = 0;
};
if(moveLeft > cWidth - this.op.offsetWidth){
moveLeft = cWidth - this.op.offsetWidth;
};
if(moveTop < 0){
moveTop = 0;
};
if(moveTop > cHeight - this.op.offsetHeight){
moveTop = cHeight - this.op.offsetHeight;
};
this.op.style.left = moveLeft + "px";
this.op.style.top = moveTop + "px";
}
});
this.op.addEventListener('mouseup', e => {
this.mouseDowm = false;
e.preventDefault();
})
}
};
let divA = document.querySelector(".a");
let divD = document.querySelector(".d");
let drag = new Drag(divA);
let drag2 = new Drag(divD);
drag.toDrag();
drag2.toDrag();
</script>
</body>
</html>
鼠標拖拽類封裝
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