js判斷對象數組等是否為空

 //是否為空
  /**
   * null undefined NaN false " " {} [] 為空 
   * 為空 true 不為空 false   
   * @param {*} value 參數
   * 
   */
  isEmpty(value) {
    let a = false;
    if (Object.prototype.toString.call(value) == "[object Array]") {
      a = value.length == 0 ? true : false;
    } else if (Object.prototype.toString.call(value) == "[object Object]") {
      a = Object.keys(value).length == 0 ? true : false;
    } else if (Object.prototype.toString.call(value) == "[object String]") {
      a = value.replace('/s', "").length == 0 ? true : false;
    } else if (Object.prototype.toString.call(value) == "[object Number]") {
      a = isNaN(value) ? true : false;
    } else if (Object.prototype.toString.call(value) == "[object Null]") {
      a = true;
    } else if (Object.prototype.toString.call(value) == "[object Undefined]") {
      a = true;
    } else if (Object.prototype.toString.call(value) == "[object Boolean]") {
      a = value ? false : true;
    }
    return a;
  }