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<!DOCTYPE html>

<head>

<title>Array-study</title>

</head>

<body>

</body>

// 引用类型数组

/*let arr = [1,2,3,4,5,6];

let arr1 = arr;

arr1.push(1)

console.log(arr,arr1)

// 引用类型对象

let obj = {a:1,b:2,c:3,d:4};

let obj1 = obj;

obj.b = 100;

console.log(obj,obj1)*/

/*============Array.concat()==============*/

/*let arrNum = [1,2,3,4,5,6]

let arrStr = ['1','2','3','4','5','6']

let arrObj = [{a:1},{b:'2'}]

let arrArr = [[1,2],['1','2']]

let arrAll = arrNum.concat(arrStr).concat(arrObj).concat(arrArr)

arrArr[0].a=3;

arrArr[0][0] = 1000000

console.log(arrAll,arrObj,arrArr)*/

/*============Array.join()==============*/

/* let arrNum = [1,2,3,4,5,6]

let arrStr = ['1','2','3','4','5','6']

let arrObj = [{a:1},{b:'2'}]

let arrArr = [[1,2],['1','2']]

console.log(arrNum.join('|'))

console.log(arrStr.join(','))

console.log(arrObj.join('-'))

console.log(arrArr.join('='))*/

/*============Array.pop()==============*/

/* let arrNum = [1,2,3,4,5,6]

let arrStr = ['1','2','3','4','5','6']

let arrObj = [{a:1},{b:'2'}]

let arrArr = [[1,2],['1','2']]

console.log(arrNum.pop())

console.log(arrStr.pop())

console.log(arrObj.pop())

console.log(arrArr.pop())

console.log(arrNum,arrStr,arrObj,arrArr)*/

/*============Array.push()==============*/

/*let arrNum = [1,2,3,4,5,6]

let arrStr = ['1','2','3','4','5','6']

let arrObj = [{a:1},{b:'2'}]

let arrArr = [[1,2],['1','2']]

let arrAll = []

console.log(arrAll.push(arrNum))

console.log(arrAll.push(arrStr))

console.log(arrAll.push(arrObj))

console.log(arrAll.push(arrArr))

console.log('改变前===',arrAll)

arrNum[0] = 10000

arrStr[0] = 10000

arrObj[0] = 10000

arrArr[0] = 10000

console.log('改变后===',arrAll)*/

/*============Array.reverse()==============*/

/*let arrNum = [1,2,3,4,5,6]

let arrStr = ['1','2','3','4','5','6']

let arrObj = [{a:1},{b:'2'}]

let arrArr = [[1,2],['1','2']]

console.log(arrNum.reverse())

console.log(arrStr.reverse())

console.log(arrObj.reverse())

console.log(arrArr.reverse())*/

/*============Array.shift()==============*/

/* let arrNum = [1,2,3,4,5,6]

let arrStr = ['1','2','3','4','5','6']

let arrObj = [{a:1},{b:'2'}]

let arrArr = [[1,2],['1','2']]

console.log(arrNum.shift())

console.log(arrStr.shift())

console.log(arrObj.shift())

console.log(arrArr.shift())

console.log(arrNum,arrStr,arrObj,arrArr)*/

/*============Array.unshift()==============*/

/*let arrNum = [1,2,3,4,5,6]

let arrStr = ['1','2','3','4','5','6']

let arrObj = [{a:1},{b:'2'}]

let arrArr = [[1,2],['1','2']]

console.log(arrNum.unshift(1,2,3,4,5,6))

console.log(arrStr.unshift('1','2','3','4','5','6'))

console.log(arrObj.unshift({a:1},{b:'2'}))

console.log(arrArr.unshift([1,2],['1','2']))

console.log(arrNum,arrStr,arrObj,arrArr)*/

/*============Array.slice()==============*/

/*let arrNum = [1,2,3,4,5,6]

let arrStr = ['1','2','3','4','5','6']

let arrObj = [{a:1},{b:'2'}]

let arrArr = [[1,2],['1','2']]

console.log(arrNum.slice(0,1))

console.log(arrStr.slice(0,1))

console.log(arrObj.slice(0,1))

console.log(arrArr.slice(0,1))

console.log(arrNum,arrStr,arrObj,arrArr)*/

/*============Array.splice()==============*/

/*let arrNum = [1,2,3,4,5,6]

let arrStr = ['1','2','3','4','5','6']

let arrObj = [{a:1},{b:'2'}]

let arrArr = [[1,2],['1','2']]

console.log(arrNum.splice(-1,1,10000))

console.log(arrStr.splice(0,0,'10000'))

console.log(arrObj.splice(0,1))

console.log(arrArr.splice(0,1))

console.log(arrNum,arrStr,arrObj,arrArr)*/

/*============Array.sort()==============*/

/* let arrNum = [6,2,1,1,3,4,5]

let arrStr = ['6','2','1','3','4','5']

let arrObj = [{b:'2'},{a:1}]

let arrArr = [['2','1'],[2,1]]

console.log('arrNum',arrNum.sort())

console.log('arrStr',arrStr.sort())

console.log('arrObj',arrObj.sort())

console.log('arrArr',arrArr.sort())

console.log(arrNum,arrStr,arrObj,arrArr)

var arr = [1,2,4,3,2,1]

console.log(arr.sort(function (m,n) {

if (m < n) return -1

if (m > n) return 1

if (m == n)return 0

}))*/

/*============Array.every()==============*/

/* //es6

let age = [10,20,30,40,50,22,26]

// 所有都满足才会返回true,否则返回false;

let result = age.every((item,index,array)=>{

console.log(item) // 10

console.log(index) // 0

console.log(array) //[10,20,30,40,50,22,26]

return item > 22;

})

// es5

// let result = age.every(function(item,index,array){

// return item > 22;

// })

console.log(result) // false*/

/*============Array.some()==============*/

//es6

/*let age = [10,20,30,40,50,22,26]

// 所有都满足才会返回true,否则返回false;

let result = age.some((item,index,array)=>{

console.log(item) // 10 20 30

console.log(index) // 0 1 2

console.log(array) //[10,20,30,40,50,22,26]

return item > 22;

})

// es5

// let result = age.some(function(item,index,array){

// return item > 22;

// })

console.log(result) // true*/

</script>

</html>

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