window.document.getElementById("moveDIV").addEventListener("touchmove", function (event) {
event.preventDefault();
if (event.targetTouches.length == 1) {
var touch = event.targetTouches[0]; // 把元素放在手指所在的位置
if(touch.pageX + $("#moveDIV").width() > $(window).innerWidth()){
window.document.getElementById("moveDIV").style.left = ($(window).innerWidth() - $("#moveDIV").width()) + 'px';
}else if(touch.pageX < $("#moveDIV").width()){
window.document.getElementById("moveDIV").style.left = 0 + 'px';
}else{
window.document.getElementById("moveDIV").style.left = touch.pageX + 'px';
}
if(touch.pageY + $("#moveDIV").height() > $(window).innerHeight()){
window.document.getElementById("moveDIV").style.top = ($(window).innerHeight() - $("#moveDIV").height())+ 'px';
}else if(touch.pageY < $("#moveDIV").height()){
window.document.getElementById("moveDIV").style.top = 0 + 'px';
}else {
window.document.getElementById("moveDIV").style.top = touch.pageY + 'px';
}
}
},false)