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javascript實現移動端上的觸屏拖拽功能，javascript拖拽
本文是分享了javascript實現移動端上的觸屏拖拽功能，具體內容如下
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實現代碼：
<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title></title> <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0" /> <style> body { height: 2000px; } #block { width:200px; height:200px; background-color: red; position: absolute; left: 0; top: 0; } </style> </head> <body> <div> touchstart,touchmove, touchend,touchcancel </div> <div id="block"></div><script> // 擷取節點 var block = document.getElementById("block"); var oW,oH; // 綁定touchstart事件 block.addEventListener("touchstart", function(e) { console.log(e); var touches = e.touches[0]; oW = touches.clientX - block.offsetLeft; oH = touches.clientY - block.offsetTop; //阻止頁面的滑動預設事件 document.addEventListener("touchmove",defaultEvent,false); },false) block.addEventListener("touchmove", function(e) { var touches = e.touches[0]; var oLeft = touches.clientX - oW; var oTop = touches.clientY - oH; if(oLeft < 0) { oLeft = 0; }else if(oLeft > document.documentElement.clientWidth - block.offsetWidth) { oLeft = (document.documentElement.clientWidth - block.offsetWidth); } block.style.left = oLeft + "px"; block.style.top = oTop + "px"; },false); block.addEventListener("touchend",function() { document.removeEventListener("touchmove",defaultEvent,false); },false); function defaultEvent(e) { e.preventDefault(); }</script> </body></html>
以上就是本文的全部內容，希望對大家學習javascript程式設計有所協助。
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