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/***测试数据*/ const num = 123const str = 'we'const arr = [12,34,56]const obj = {
     a: 1,  b: true,  c: {
       d: 'li'  }}const bo = true/***写法1*/ Object.prototype.clone = function() {
     // 数值型：字符串、数字、布尔值  if (this instanceof String || this instanceof Number || this instanceof Boolean) {
       return this  }  // 引用型  const o = this.constructor === Array ? [] : {
   }  for (var e in this) {
       if (e !== 'clone') {
         o[e] = typeof this[e] === 'object' ? this[e].clone() : this[e]    }  }  return o}const num1 = num.clone()console.log(num1)const str1 = str.clone()console.log(str1)const arr1 = arr.clone()console.log(arr1)const obj1 = obj.clone()console.log(obj1)const bo1 = bo.clone()console.log(bo1)/***写法2*/ function clone(arg) {
     // 数值类型  if (['number', 'string', 'booblean'].includes(typeof arg)) {
       return arg  }  // 引用类型  const o = arg instanceof Array ? [] : {
   }  for (let key in arg) {
       o[key] = typeof arg[key] === 'object' ? clone(arg[key]) : arg[key]  }  return o}console.log(clone(num))console.log(clone(str))console.log(clone(arr))console.log(clone(obj))console.log(clone(bo))/***写法3*/ function clone1(arg) {
     if (arg instanceof Array) {
       const arr = []    let i = arg.length    while (i--) {
         arr[i] = clone1(arg[i])    }    return arr  } else if (arg instanceof Object) {
       const o = {
   }    for (let key in arg) {
         // console.log(key, arg[key] instanceof Function, '=====000')      if (arg[key] instanceof Function) {
    // 此处加这个判断是因为写法一中给Object的原型加上了clone方法，需要剔除掉，不然会报错        continue      } else {
           o[key] = clone1(arg[key])      }          }    return o  } else {
       return arg  }}console.log(clone1(arr))console.log(clone1(num))console.log(clone1(str))console.log(clone1(bo))console.log(clone1(obj))

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