javascript - 除了 switch 语句之外的不同写法

Question

我有以下 switch 语句:

        switch (result.innerHTML) {
            case "":
            case " ":
                result.innerHTML = "Stage1";
                result.style.backgroundColor = "green";
                break;
            case "Stage1":
                result.innerHTML = "Stage2";
                result.style.backgroundColor = "red";
                break;
            case "Stage2":
                result.innerHTML = "Stage3";
                result.style.backgroundColor = "yellow";
                break;
            case "Stage3":
                result.innerHTML = "Stage4";
                result.style.backgroundColor = "pink";
                break;
            case "Stage4": //start over
                result.innerHTML = "";
                result.style.backgroundColor = "";
                break;
            default:
        }

在 JavaScript 中是否有另一种简洁的方法来做到这一点？也许使用数组或 JavaScript 对象？

Answer 1

我喜欢这个开关。它易于阅读和理解。有时更短的代码并不总是更好的代码。

这是一个替代方案。

var states  {
    "":         ["Stage1","green"],
    " ":   ["Stage1","green"],
    "Stage1":   ["Stage2","red"],
    "Stage2":   ["Stage3","yellow"],
    "Stage3":   ["Stage4","pink"],
    "Stage4":   ["",""]
};
if(result.innerHTML in stages)
{
    result.style.backgroundColor = stages[result.innerHTML][1];
    result.innerHTML = stages[result.innerHTML][0];
}