【JavaScript】用Switch實現成績等級判斷

let score = prompt("請輸入成績：");//輸入成績
let  a = parseInt(score / 10);//將字符串轉換為數字
switch (a) {
    case 6:
        console.log(`成績為${score},成績等級為D`);
        break;
    case 7:
        console.log(`成績為${score},成績等級為C`);
        break;
    case 8:
        console.log(`成績為${score},成績等級為B`);
        break;
    case 9:
        console.log(`成績為${score},成績等級為A`);
        break;
    default:
        console.log(`成績為${score},成績等級為E`);
        break;
}