//獲取元素的物理尺寸，參數(shù)：element隱藏的元素節(jié)點(diǎn);targetEl需要獲取尺寸的目標(biāo)元素this.getSize = function(element,targetEl) { //增加隱藏，防止element在取消隱藏時(shí)閃爍; position: absolute;和display:none看需要是否加上 var _addCss = { visibility: 'hidden' }; var _oldCss = {}; var _width; var _height; if (this.getStyle(element, "display") != "none") {  return { width: !!targetEl ? targetEl.offsetWidth : element.offsetWidth , height: !!targetEl ? targetEl.offsetHeight : element.offsetHeight }; } for (var i in _addCss) {  _oldCss[i] = this.getStyle(element, i); } this.setStyle(element, _addCss); //這里是通過(guò)angularjs的ng-show指令隱藏元素的，去掉ng-hide樣式類(lèi)就可以取消隱藏 var _isNgHide = element.classList.contains("ng-hide"); _isNgHide && element.classList.remove("ng-hide"); _width = !!targetEl ? targetEl.offsetWidth : element.offsetWidth; _height =!!targetEl ? targetEl.offsetHeight : element.offsetHeight; //還原之前的樣式，class this.setStyle(element, _oldCss); _isNgHide && element.classList.add("ng-hide"); return { width: _width, height: _height };};

this.getStyle = function(element, styleName) { return element.style[styleName] ? element.style[styleName] : element.currentStyle ? element.currentStyle[styleName] : window.getComputedStyle(element, null)[styleName];};this.setStyle = function(element, obj){ if (angular.isObject(obj)) {  for (var property in obj) {   var cssNameArr = property.split("-");   for (var i = 1,len=cssNameArr.length; i < len; i++) {    cssNameArr[i] = cssNameArr[i].replace(cssNameArr[i].charAt(0), cssNameArr[i].charAt(0).toUpperCase());   }   var cssName = cssNameArr.join("");   element.style[cssName] = obj[property];  } } else if (angular.isString(obj)) {  element.style.cssText = obj; }};