var a = 1
var b = a
b++
console.log(a) //1
console.log(b) //2
字符串类型
var q = 'copy'
var s = q
s += '1'
console.log(q)//copy
console.log(s)//copy1
布尔类型
var e = false
var w = e
w = true
console.log(e) //false
console.log(w) //true
数组
splice 截取 会改变原数组
//地址的引用 浅拷贝
var array = [1,2,3,4,5]
var newArray = array
var thArray = newArray.splice(1,3)
console.log(thArray) //[2,3,4]
console.log(newArray) //[1,5]
console.log(array) //[1,5]
//循环到原始类型进行深拷贝
var arr = ['a','b','c','d','e']
var newArr = []
for(var i=0i<arr.lengthi++){
newArr.push(arr[i])
}
var thArr = newArr.splice(1,3)
console.log(thArr) //["b", "c", "d"]
console.log(newArr) //["a", "e"]
console.log(arr) //["a", "b", "c", "d", "e"]
对象
//地址的引用 浅拷贝
var obj = {name:'abc',id:'1'}
var newObj = obj
newObj.name='abcde'
console.log(obj) //{name:'abcde',id:'1'}
console.log(obj) //{name:'abcde',id:'1'}
//循环到原始类型进行深拷贝
var object = {name:'321',id:'1'}
var newObject= {}
for (var j in object){
newObject[j]=object[j]
}
newObject.name='abcde'
console.log(newObject) //{name:'abcde',id:'1'}
console.log(object) //{name:'321',id:'1'}
数字 字符串 布尔类型 为原始类型，是值引用
数组 对象类型 为地址引用
值引用为深拷贝
地址引用循环到原始类型可进行深拷贝
var nameArray = ['张三','李四']
var descArray = ['张三是男生','李四也是男生']
var allArray = []
var tableObj={}
for(let i=0i<nameArray.lengthi++){
tableObj.name=nameArray[i]
tableObj.desc=descArray[i]
allArray.push(tableObj)
}
console.log(allArray) //{name: "李四", desc: "李四也是男生"}
//{name: "李四", desc: "李四也是男生"}
var nameArray = ['张三','李四']
var descArray = ['张三是男生','李四也是男生']
var allArray = []
for(let i=0i<nameArray.lengthi++){
var tableObj={}
tableObj.name=nameArray[i]
tableObj.desc=descArray[i]
allArray.push(tableObj)
}
console.log(allArray) //{name: "张三", desc: "张三是男生"}
//{name: "李四", desc: "李四也是男生"}
数组的下标都是连续的,想要把一个数组的下标放到另一个数组中,只需要把这个数组的长度求出来就行了例如数组 int[] a={1,2,3}存储数组a下标的数组int[] b ={0,1,2}代码如下:
int[] a ={1,2,3}
int count = a.length
int[] b = new int[count]
for(int i =0i<counti++)
{
b[i]=i
}
