本文给大家分享一个用原生JS实现拖拽元素时与另个一元素碰撞检测的小Demo，效果如下：
实现代码如下， 欢迎大家复制粘贴。
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<!DOCTYPE html><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>原生JS实现拖拽元素时与另个一元素碰撞检测</title> <style> #div1 { width: 100px; height: 100px; background: red; position: absolute; z-index: 2; } #div2 { width: 100px; height: 100px; background: yellow; position: absolute; left: 230px; top: 220px; z-index: 1; } </style> <script> window.onload = function () { var oDiv = document.getElementById('div1'); var oDiv2 = document.getElementById('div2'); // 鼠标按下时 oDiv.onmousedown = function (ev) { var oEvent = ev || event; var disX = oEvent.clientX - oDiv.offsetLeft; var disY = oEvent.clientY - oDiv.offsetTop; // 鼠标移动时 document.onmousemove = function (ev) { var oEvent = ev || event; oDiv.style.left = oEvent.clientX - disX + 'px'; oDiv.style.top = oEvent.clientY - disY + 'px'; var l1 = oDiv.offsetLeft; var r1 = oDiv.offsetLeft + oDiv.offsetWidth; var t1 = oDiv.offsetTop; var b1 = oDiv.offsetTop + oDiv.offsetHeight; var l2 = oDiv2.offsetLeft; var r2 = oDiv2.offsetLeft + oDiv2.offsetWidth; var t2 = oDiv2.offsetTop; var b2 = oDiv2.offsetTop + oDiv2.offsetHeight; // 碰撞检测的规则 if (r1 < l2 || l1 > r2 || b1 < t2 || t1 > b2) { // 如果没有碰到 oDiv2.style.background = 'yellow'; } else { // 如果碰到了 oDiv2.style.background = 'green'; } }; // 鼠标抬起时 document.onmouseup = function () { document.onmousemove = null; document.onmouseup = null; }; }; }; </script></head> <body> <div id="div1"></div> <div id="div2"></div></body> </html> |
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服务器之家。
原文链接：https://blog.csdn.net/weixin_40629244/article/details/99670724
