Javascript 中if else语句问题

Question

为什么if语句执行完 else if语句就不往下执行了，不应该啊

var arr=[1,2,3,4,5];
var arrOut = {
    one:'',
    two:'',
    three:'ph',
    four:'',
    five:'',
}
var arrNumber = 0;
var arrLength = arr.length;
for(i=0;i<arrLength;i++){
    arrNumber = i + 1;
    console.log(arrNumber);
    if(arrNumber = 1){
        arrOut.one = "第1个元素的值是："+ arrNumber
        console.log("已执行1");
    }else if(arrNumber = 2){
        arrOut.two = "第2个元素的值是："+ arrNumber
        console.log("已执行2");
    }else if(arrNumber = 3){
        arrOut.three = "第3个元素的值是："+ arrNumber
        console.log("已执行3");
    }else if(arrNumber = 4){
        arrOut.four = "第4个元素的值是："+ arrNumber
        console.log("已执行4");
    }else{
        arrOut.five = "第4个元素的值是："+ arrNumber
        console.log("已执行5");
    }
            
 }

Answer 1

应该是两个等号==