function doGet(obj, pathArr, parentModel) {
	        for (var i = 0; i < pathArr.length; i++) {
	            // Ignore empty
	            if (!pathArr[i]) {
	                continue;
	            }
	            // obj could be number/string/... (like 0)
	            obj = (obj && typeof obj === 'object') ? obj[pathArr[i]] : null;
	            if (obj == null) {
	                break;
	            }
	        }
	        if (obj == null && parentModel) {
	            obj = parentModel.get(pathArr);
	        }
	        return obj;
	    }
@param {Function} getParentMethod
       param {Array.<string>|string} path
       return {module:echarts/model/Model}