array

can traverse an array and return a new array

1
<array>.map(function(element,index){
2
    element //array element
3
    index //array index
4
    return element + 10 //Can be modified
5
})

can traverse an array,but cannit return

1
<array>.forEach(function(element,index){
2
    element //array element
3
    index //array index
4
})

can traverse an array and return a new array

1
<array>.filter(function(element,index){
2
    element //array element
3
    index //array index
4
    return element > 10 //Can be compared
5
})

Return the cumulative processing result, used for summation

1
<array>.reduce(function(prev,current){
2
    return prev + current
3
},<initial value>)

convert an array to a string

1
<array>.join(["split symbol"])

if the split symbol is empty,it is comma separated

同类文章