题解 | #修改 this 指向#

let line;
while (line = readline()) {
    let x=0,y=0
    const directions = line.split(';');
    
    directions.forEach(item =>{
        if(/^[A|S|D|W]\d{1,2}$/i.test(item)){
            let first = item[0];
            if(first === 'A'){
                x-= item.slice(1);
            }
            else if(first === 'D'){
                 x+= Number(item.slice(1));
            }
            else if(first === 'W'){
                 y+= Number(item.slice(1));
            }
             else if(first === 'S'){
                 y-= item.slice(1);
            }
           }
    })
    console.log([x,y])
}