移動端拖動並點擊，仿蘋果手機小圓點

var isClick=true;
$('.memeber-listfix').each(function(index){
 $(this).on('touchstart', function(evt) {
 var e = event || evt;
 disX = e.touches[0].clientX - this.offsetLeft;
 disY = e.touches[0].clientY - this.offsetTop;
 starX = e.touches[0].clientX;
 starY = e.touches[0].clientY;
 isClick=true;
 }).on('touchmove', function(evt) {
 var e = event || evt;
 e.preventDefault();//阻止其餘事件
 // 若是這個元素的位置內只有一個手指的話
 //console.log(e.targetTouches)
 L = e.touches[0].clientX - disX;
 T = e.touches[0].clientY - disY;
 starXEnd = e.touches[0].clientX - starX;
 starYEnd = e.touches[0].clientY - starY;
 //console.log(L);
 if (L < 0) {
 L = 0;
 } else if (L > document.documentElement.clientWidth - this.offsetWidth) {
 L = document.documentElement.clientWidth - this.offsetWidth;
 }
 if (T < 0) {
 T = 0;
 } else if (T > document.documentElement.clientHeight - this.offsetHeight) {
 T = document.documentElement.clientHeight - this.offsetHeight;
 }
 moveX = L + 'px';
 moveY = T + 'px';
 //console.log(moveX);
 this.style.left = moveX;
 this.style.top = moveY;
 isClick=false;
 }).on('touchend', function(evt) {
 var e = event || evt;
 e.preventDefault();//阻止其餘事件
 if(isClick==true){
 window.location.href='javascript:history.go(-1)'
 };
 })
});