字符串替换问题,不会替换

Question

把字符串“javascript is awesome”替换成“j4v4scr1pt 1s 4w3s0m”
var input="javascript is awesome";
var output="";
for(var i=0;i<input.length;i++){
output+=input[i];
output["a"]=["4"];
output["o"]=["0"];
output["i"]=["1"];
output["e"]=["3"];
}

console.log(output)

Answer 1

这个是我朋友帮我解答的，因为我学的很基本的，所以只能看懂这个

 var input="javascript is awesome";
var output="";
for(var i=0;i<input.length;i++){
    if(input[i] == 'a'){
        output += '4';
    }else if(input[i] == 'i'){
        output += '1';
    }else if(input[i] == 'o'){
        output += '0';
    }else if(input[i] == 'e'){
        output += '3';
    }else{
        output += input[i];
    }
}
console.log(output);