其中a为file input，form1为a所在的表单
获取文件域用.value ~~
a.substr(a.length-3,3)这样吧
let A = [6,9,10,11,13,15]let B = [2,3,4,5,6,9,10]
let C = [2,3,4,7,9,10]
let D = []
let k = 0
let interval = setInterval(function () {
let num = A[k]
if(B[0]<= A[k]){
if(C[0]<=B[0]){
num = C[0]
C.splice(0,1)
}else{
num = B[0]
B.splice(0,1)
}
}else{
if(C[0]<=A[k]){
num=C[0]
C.splice(0,1)
}else{
num = A[k]
k++
}
}
if(k == A.length + 1){
clearInterval(interval)
console.log('D:' + D)
return
}
D.push(num)
},10)
