JAVAscript的数组arr怎么用啊

JavaScript09

JAVAscript的数组arr怎么用啊,第1张

var arr = new Array()//申明一个无长度的arr数组,也可以这样:

//一维数组var arr = new Array("1","5","3"),

//二维数组，var arr = new Array(['1','2'],['3','4'])。还可以这样

//var arr=[1,2,3,4,5,6,7,8,9]

arr[0] = 1arr[2] = 5arr[3] = 3//进行赋值

for(var i = 0i <arr.length - 1i++) {//进行从大到小的排序

for(var j = 1j <arr.lengthj++) {

if(arr[i] <arr[j]) {

var temp = arr[i]

arr[i] = arr[j]

arr[j] = temp

}

}

}

alert(arr.join("<"))//提示框中提示arr数组中的所有项且把没个元素用‘<’链接起来的字符

//串，其结果为：5<3<1。join(str)函数是把数组中的元素用str连接起来成

//字符串

let arr = [{

DyeWorkQtyA:"DyeWorkQtyA" ,

DyeWorkQtyB: "DyeWorkQtyB",

EmpNameA: "EmpNameA",

EmpNameB: "EmpNameB",

LingBanA: "LingBanA",

LingBanB: "LingBanB",

MachineName: "MachineName",

MonthWorkQtyA: "MonthWorkQtyA",

MonthWorkQtyB: "MonthWorkQtyB",

ShiftNameA: "ShiftNameA",

ShiftNameB: "ShiftNameB",

firstColumn: "firstColumn",

}]

let arrs = arr[0]

let third = []

let arr1 = []

let rows = []

for(let i in arrs){

let col = i.substring(0, (i.length -1))

let last = i.substr(-1)

let ins = false

for(let j in rows){

if(rows[j] == col){

ins = true

break

}

}

if(!ins &&(last == 'A' || last == 'B')){

rows.push(col)

}

}

for(let row in rows){

let temp = []

for(let key in arrs){

let last = key.substr(-1)

if(key.indexOf(rows[row]) != -1){

temp.push({[last]: arrs[key]})

}

}

third.push(temp)

}

for(let key in arrs){

let first = key.substr(0, 1)

let last = key.substr(-1)

if(last != 'A' &&last != 'B' &&/[A-Z]/.test(first)){

arr1.push({[key]: ''})

}

}

arr1.push({'thirdColumn': third})

console.log(JSON.stringify(arr1))

这个需要你在输出的时候加上'[ ]'符号的，遍历输出的时候加上

<script>

var arr = [[1,2,3],[4,5,6]]

document.write('[')

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

document.write(' [ ')

for(var j = 0 j <arr[i].length j++){

document.write(arr[i][j])

}

if(i !=arr.length-1){

document.write(' ] , ')

}else{

document.write(' ] ')

}

}

document.write(' ] ')

</script>