字符串数组中的对象排序

字符串排序

　　降序

sortByDown(keyName) {
               return function (objectN, objectM) {
                   let valueN = objectN[keyName]
                   let valueM = objectM[keyName]
                   if (valueN < valueM) return 1
                   else if (valueN > valueM) return -1
                   else return 0
               }
           }

　　升序

sortBy(keyName) {
                return function (objectN, objectM) {
                    let valueN = objectN[keyName]
                    let valueM = objectM[keyName]
                    if (valueN > valueM) return 1
                    else if (valueN < valueM) return -1
                    else return 0
                }
            },

数值排序

numSortByDown(prop){
              return function (obj1, obj2) {
                   let val1 = obj1[prop] * 1
                   let val2 = obj2[prop] * 1
                   if (val1 < val2) {
                       return 1;
                   } else if (val1 > val2) {
                       return -1;
                   } else {
                       return 0;
                   }            
               } 
           },