javascript - 抓取数组的一个元素

Question

var input = prompt();
var binput = input.split("");
var inputl = input.split(" ").length

if ( inputl % 5 == 0 ) {
    binput.forEach(function(v, i) {
        if (v === "a") {
            binput[i] = "$"
        }
    })
}

我的问题是，我只想更改 inputl 的第 5 个、第 10 个、第 15 个...元素，现在它更改了整个文本 if (inputl % 5 == 0) 。但是我只想获取 inputl 数组的第五个元素。

Answer 1

my problem here is that i want only the 5th 10th 15th

试试这个

binput.forEach(function(v, i) { //iterate once
     if( (i + 1 ) % 5 == 0)  //check if the element is 5th, 10th, 15th etc
     {
         binput[i] = "$"; //assign the value as you like
     }
}};

编辑:

如果您还想在分配新值之前检查该值是否为“a”，请尝试

binput.forEach(function(v, i) { //iterate once
     if( v == "a" && ( (i + 1 ) % 5 == 0 ) )  //check if the element is 5th, 10th, 15th etc
     {
         binput[i] = "$"; //assign the value as you like
     }
}};