JS常用方法记录

 //对Object的num字段进行排序　　var compare = function (propertyName) {　　　　return function (object1, object2) {

　　　　var value1 = object1[propertyName];
            var value2 = object2[propertyName];
            if (value2 < value1) {
                return -1;
            }
            else if (value2 > value1) {
                return 1;
            }
            else {
                return 0;
            }
        }
    }
    Object.sort(compare(‘num‘));