以题目A+B为例：点此试试

1.获取用户输入

while(line=readline()){
    let lines = line.split(' ');  //字符串转换为字符数组
    let a = parseInt(lines[0]);
    let b = parseInt(lines[1]);
    print(a+b);
}

2.多行输入

let n = parseInt(readline());
let ans = 0;
for(let i = 0;i < n; i++){
    lines = readline().split(" ")
    for(let j = 0;j < lines.length; j++){
        ans += parseInt(lines[j]);
    }
    print(ans);
}