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JavaScript簡單拖拽效果（1），javascript拖拽效果
拖拽在前端開發中是很常見的功能，也是基本功之一，本文是不限制範圍的拖拽也就是最簡單的拖拽，滑鼠按下對象，拖拽，鬆開停止！
1，onmousedown事件
2，onmousemove事件
3，onmouseup事件
因為在按下時拖動，所以onmousemove事件在down後才註冊，up事件是用來解除綁定事件，消除事件！
<!DOCTYPE html><html><head> <meta charset="utf-8"> <title>簡單拖拽</title> <style type="text/css"> * { margin: 0; padding: 0; } #div1 { width: 100px; height: 100px; background: orange; position: absolute; } </style></head><body style="height: 500000px;"> <div id="div1"></div> <script type="text/javascript"> function getStyle(obj, attr) { if (obj.currentStyle) { return obj.currentStyle[attr]; } else { return getComputedStyle(obj, null)[attr]; } } var oDiv = document.getElementById('div1'); oDiv.onmousedown = function(ev) { var oEvent = ev || event; // var disX = oEvent.clientX - oDiv.offsetLeft; // var disY = oEvent.clientY - oDiv.offsetTop; var disX = oEvent.clientX - parseInt(getStyle(oDiv, 'left')); var disY = oEvent.clientY - parseInt(getStyle(oDiv, 'top')); document.onmousemove = function(ev) { var oEvent = ev || event; oDiv.style.left = oEvent.clientX - disX + 'px'; oDiv.style.top = oEvent.clientY - disY + 'px'; }; document.onmouseup = function() { document.onmousemove = null; document.onmouseup = null; }; return false; }; </script></body></html>
以上就是本文的全部內容，希望對大家的學習有所協助，也希望大家多多支援幫客之家。
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