touchstarttouchmovetouchend 实现移动端上的触屏拖拽

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<!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>
        // 获取节点
        var block = document.getElementById("block");
        var oW,oH;
        // 绑定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;
            //阻止页面的滑动默认事件
            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>

 

注：本例在谷歌浏览器的模拟器上测试，未进行真机测试！

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