arry.push()
2.向数组的头部添加元素
arry.unshift()
3.向数组中间添加元素
arrayObject.splice(index,howmany,item1,.....,itemX)
function insert(arrfirst,arrlast,index){ //将数组arrlast插入数组arrfirst中，index是想要插入的位置if (index < 0){
index = 0
}else if(index > arrfirst.length){
index = arrfirst.length
}
var arr = []
for (var i = 0 i < index i++){
arr.push(arrfirst[i])
}
for (var i = 0 i < arrlast.length i++){
arr.push(arrlast[i])
}
for (var i = index i < arrfirst.length i++){
arr.push(arrfirst[i])
}
return arr
}
var arr1 = ["1","2","3"]
var arr2 = ["a","b","c"]
console.log(insert(arr1,arr2,0))
alert(insert(arr1,arr2,1))
还有一种方法
function insert(arrfirst,arrlast,index){if (index < 0){
index = 0
}else if(index > arrfirst.length){
index = arrfirst.length
}
for (var i = arrlast.length-1 i >= 0 i--){
arrfirst.splice(index,0,arrlast[i])//是在index位置用arrlast[i]替换掉arrfirst数组中的0个元素
}
return arrfirst
}
var arr1 = ["1","2","3"]
var arr2 = ["a","b","c"]
console.log(insert(arr1,arr2,0))
alert(insert(arr1,arr2,1))
希望能帮到你
