Record some small requirements in the form of cases

1, With arr As a template ,arr1 It's the random data from the interface , To put arr1 According to arr Sort .
If arr1 There is , and arr Not found in , That is, the new interface , Just line up behind

 var arr = ['t1', 't2', 't3', 't4', 't5', 't6', 't7']
    var arr1 = ['t5', 'n2', 't3', 'n1','t1']
    let temp = arr.filter(item => arr1.includes(item))   
    let temp1 = arr1.filter(item => !arr.includes(item))  
     let tempNew = temp.concat(temp1)
     console.log(tempNew, 'tempNew')  //['t1', 't3', 't5', 'n2', 'n1']0: "t1"1: "t3"2: "t5"3: "n2"4: "n1"length: 5[[Prototype]]: Array(0) 'tempNew'

2, From the key values in the array , Take out the value of the corresponding key , Sum up

   var arr=[
        {
    a:1,b:443,c:12},
        {
    a:1,b:443,c:12},
        {
    a:1,b:443,c:12},
        {
    a:1,b:443,c:12},
        {
    a:1,b:443,c:12},
    ]
    var arrtemp=[]
    arr.map((item)=>{
    
        arrtemp.push(item.b)
    })
    arrtemp.reduce((p,c)=>{
    
        sum=p+c
    return sum

    })
    console.log(sum)