var ele = document.getElementsByClassName('target_node_class')[0] //may have x and y properties in some browsers,But it always has left, top, right, and bottom properties. var rect = ele.getBoundingClientRect(); var touch = new Touch({ "identifier&qu
js模拟Map对象,实现key---value 根据java中map的属性,实现key----value保存 function Map() { var struct = function (key, value) { this.key = key; this.value = value; } var put = function (key, value) { for (var i = 0; i < this.arr.length; i++) { if (this.arr[i].key === k