本文实例为大家分享了js实现限定区域范围拖拉拽的具体代码，供大家参考，具体内容如下

需要在范围内拖拉拽，之前看来许多资料觉得都不是特别满足要求，今天自己写了一个，通过监听鼠标按下、鼠标抬起、鼠标移动事件来控制

代码如下

Document

#drag {

background: aqua;

width: 200px;

height: 200px;

position: absolute;

-moz-user-select: none;

-khtml-user-select: none;

user-select: none;

}

#parent {

position: relative;

background: #cde4dc;

height: 80vh;

overflow: hidden;

}

//自执行函数,需要拖拽的元素需要设置position:absolute,父元素position:relative

//有传父亲节点、若无则默认body为父节点

((parent, children, mouseType) => {

if (!children) return;

let childrenDiv = document.querySelector(children);

childrenDiv.style.position = 'absolute';

let parentDiv = parent

? document.querySelector(parent)

: document.querySelector('body');

let isDown = false;

let x,

y,

l,

t = 0;

childrenDiv.onmousedown = function (e) {

x = e.clientX;

y = e.clientY;

// 获取左部和底部的偏移量

l = childrenDiv.offsetLeft;

t = childrenDiv.offsetTop;

isDown = true;

childrenDiv.style.cursor = mouseType || 'move';

};

// 鼠标移动

window.onmousemove = function (e) {

if (!isDown) {

return;

}

//获取移动后的x和y坐标

let nx = e.clientX;

let ny = e.clientY;

//获取父元素的宽高

let parentWidth = parentDiv.clientWidth;

let parentHeight = parentDiv.clientHeight;

//获取子元素的宽高

let childrenWidth = childrenDiv.clientWidth;

let childrenHight = childrenDiv.clientHeight;

// 计算移动后的左偏移量和顶部偏移量

let nLeft = nx - (x - l);

let nTop = ny - (y - t);

let nRight = nLeft + childrenWidth;

let nBottom = nTop + childrenHight;

nLeft = nLeft <= 0 ? 0 : nLeft; //判断左边距离是否越界

nTop = nTop <= 0 ? 0 : nTop; //判断上边距离是否越界

//判断右边距离大于父元素宽度

if (nRight >= parentWidth) {

nLeft = parentWidth - childrenHight;

}

// 判断下边界是否越界

if (nBottom >= parentHeight) nTop = parentHeight - childrenHight;

childrenDiv.style.left = nLeft + 'px';

childrenDiv.style.top = nTop + 'px';

};

// 鼠标抬起事件

document.onmouseup = function (e) {

//鼠标抬起

isDown = false;

childrenDiv.style.cursor = 'default';

};

})('#parent', '#drag', 'move');

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。