JS實現拖拽元素時與另一元素碰撞檢測
阿新 • • 發佈:2020-08-29
本文給大家分享一個用原生JS實現拖拽元素時與另個一元素碰撞檢測的小Demo,效果如下:
實現程式碼如下, 歡迎大家複製貼上。
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>原生JS實現拖拽元素時與另個一元素碰撞檢測</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'); // 滑鼠按下時 oDiv.onmousedown = function (ev) { var oEvent = ev || event; var disX = oEvent.clientX - oDiv.offsetLeft; var disY = oEvent.clientY - oDiv.offsetTop; // 滑鼠移動時 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; // 碰撞檢測的規則 if (r1 < l2 || l1 > r2 || b1 < t2 || t1 > b2) { // 如果沒有碰到 oDiv2.style.background = 'yellow'; } else { // 如果碰到了 oDiv2.style.background = 'green'; } }; // 滑鼠抬起時 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內容,希望對大家的學習有所幫助,也希望大家多多支援我們。