<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>悬浮窗拖动点击事件</title>
<style>
div {
width: 100px;
height: 100px;
position: fixed;
border-radius: 50%;
left: calc(100% - 100px);
background-color: red;
}
</style>
</head>
<body>
<div class="div" draggable="true" id="back-button"></div>
</body>
<script>
window.onload = function () {
// 标记是拖曳还是点击
var oDiv = document.getElementById('back-button');
var disX, moveX, L, T, starX, starY, starXEnd, starYEnd;
let beforeX, beforeY; // 鼠标点击的坐标
var is_clicked = false;
oDiv.addEventListener('click', function(e){
var mousemove_fun = function(eve){
L = e.clientX - disX;
T = e.clientY - disY;
moveX = L + 'px';
moveY = T + 'px';
this.style.left = moveX;
this.style.top = moveY;
}
if (is_clicked){
is_clicked = false;
oDiv.style.backgroundColor="red";
oDiv.removeEventListener("mousemove", mousemove_fun);
}else{
is_clicked = true;
oDiv.style.backgroundColor="black";
disX = e.clientX - this.offsetLeft;
disY = e.clientY - this.offsetTop;
oDiv.addEventListener("mousemove", mousemove_fun);
}
});
oDiv.addEventListener('dragstart', function(e){
// console.log(e);
disX = e.clientX - this.offsetLeft;
disY = e.clientY - this.offsetTop;
});
oDiv.addEventListener('drag', function(e){
// console.log(e);
L = e.clientX - disX;
T = e.clientY - disY;
if (L < 0) {
L = 0;
} else if (L > document.documentElement.clientWidth - this.offsetWidth) {
L = document.documentElement.clientWidth - this.offsetWidth;
}
if (T < 0) {
T = 0;
} else if (T > document.documentElement.clientHeight - this.offsetHeight) {
T = document.documentElement.clientHeight - this.offsetHeight;
}
moveX = L + 'px';
moveY = T + 'px';
this.style.left = moveX;
this.style.top = moveY;
e.preventDefault();
});
oDiv.addEventListener('dragend', function(e){
// console.log(e);
L = e.clientX - disX;
T = e.clientY - disY;
if (L < 0) {
L = 0;
} else if (L > document.documentElement.clientWidth - this.offsetWidth) {
L = document.documentElement.clientWidth - this.offsetWidth;
}
if (T < 0) {
T = 0;
} else if (T > document.documentElement.clientHeight - this.offsetHeight) {
T = document.documentElement.clientHeight - this.offsetHeight;
}
moveX = L + 'px';
moveY = T + 'px';
this.style.left = moveX;
this.style.top = moveY;
e.preventDefault();
});
oDiv.addEventListener('touchstart', function (e) {
// console.log(e);
beforeX = this.offsetLeft;
beforeY = this.offsetTop;
e.preventDefault();
// 阻止触摸时页面的滚动，缩放
disX = e.touches[0].clientX - this.offsetLeft;
disY = e.touches[0].clientY - this.offsetTop;
// 手指按下时的坐标
starX = e.touches[0].clientX;
starY = e.touches[0].clientY;
});
oDiv.addEventListener('touchmove', function (e) {
// console.log(e);
L = e.touches[0].clientX - disX;
T = e.touches[0].clientY - disY; // 移动时 当前位置与起始位置之间的差值
starXEnd = e.touches[0].clientX - starX;
starYEnd = e.touches[0].clientY - starY;
if (L < 0) {
// 限制拖拽的X范围，不能拖出屏幕
L = 0;
} else if (L > document.documentElement.clientWidth - this.offsetWidth) {
L = document.documentElement.clientWidth - this.offsetWidth;
}
if (T < 0) {
// 限制拖拽的Y范围，不能拖出屏幕
T = 0;
} else if (T > document.documentElement.clientHeight - this.offsetHeight) {
T = document.documentElement.clientHeight - this.offsetHeight;
}
moveX = L + 'px';
moveY = T + 'px';
this.style.left = moveX;
this.style.top = moveY;
});
oDiv.addEventListener('touchend', function () {
// console.log(e);
// 鼠标点击的坐标 和 抬起额坐标一致 就是点击事件
if (beforeX === this.offsetLeft && beforeY === this.offsetTop) {
alert('点击')
}
});
}
</script>
</html>
可以实现鼠标拖动和触摸拖动，以及点击后跟随鼠标移动
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