最近做个微信小程序，发现需要深度复制数组和字典，于是写了这个 Javascript 代码，可能考虑欠佳，欢迎增加及修订：

deepCopy: function (source) {

// tyopeof ref: https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/typeof

var _this = this

//看看是否独立变量

if (source) {

if (typeof source === ‘string’) return source

else if (typeof source === ‘boolean’) return source

else if (typeof source === ‘number’) return source

//else if (typeof source === ‘object’) return null

}

else {

if (typeof source === ‘undefined’) retur nnull

else if (typeof source === ‘string’) return ”

else if (typeof source === ‘boolean’) return false

else if (typeof source === ‘number’) return 0

else if (typeof source === ‘object’) return null

}

//处理对象：数组，字典等等

var result

//确定源是数组，还是字典

if (source.length && (typeof source.length === ‘number’)) {

//数组

result = []

for(var i=0; i< source.length; i++) {

result.push(_this.deepCopy(source[i]))

}

}

else if (typeof source.length === ‘undefined’) {

//字典

result = {}

for (var key in source) {

if (source[key]) {

result[key] = typeof source[key] === ‘object’ ? _this.deepCopy(source[key]) : source[key]

}

else {

if (typeof source[key] === ‘string’) result[key] = ”

else if (typeof source[key] === ‘boolean’) result[key] = false

else if (typeof source[key] === ‘number’) result[key] = 0

else if (typeof source[key] === ‘object’) result[key] = null

}

}

}

return result

}