Javascript Switch语句未更新文档。getElementById（）

我有一个Switch语句，看起来像这样

switch (rsCash.length){
case 1:
    document.getElementById("cash3").innerHTML = rsCash + "Gp";
    break;
case 2:
    document.getElementById("cash3").innerHTML = rsCash + "Gp";
    break;
case 3:
    document.getElementById("cash3").innerHTML = rsCash + "Gp";
    break;
case 4:
    document.getElementById("cash3").innerHTML = rsCash.substring(0,cut1) + "k";
    break;
case 5:
    document.getElementById("cash3").innerHTML = rsCash.substring(0,cut2) + "k";
    break;
case 6:
    document.getElementById("cash3").innerHTML = rsCash.substring(0,cut3) + "k";
    break;
case 7:
    document.getElementById("cash3").innerHTML = rsCash.substring(0,cut1) + "M";
    break;
case 8:
    document.getElementById("cash3").innerHTML = rsCash.substring(0,cut2) + "M";
    break;
case 9:
    document.getElementById("cash3").innerHTML = rsCash.substring(0,cut3) + "M";
    break;
case 10:
    document.getElementById("cash3").innerHTML = rsCash.substring(0,cut4) + "M";
    break;
case 11:
    document.getElementById("cash3").innerHTML = rsCash.substring(0,cut5) + "M";
    break;

}

当rsCash变量更改时，它不会更新

HTML是

<h1 id="RsMoney">RsCash:<b id="cash3">0 Gp</b></h1>

rsCash是一个数字：

rsCash = rsCash + 200000;

但你想知道它的长度：

switch (rsCash.length) ...

你不能这么做，因为你没有定义，所以你的案子都不会发生。在计算rsCash的长度之前，需要将其转换为字符串；大概是这样的：

switch (rsCash.toString().length) ...

---

rsCash变量是如何变化的？刚刚用改变变量的函数对其进行了更新。现在我在google chrome中收到一条错误消息，上面说错误：无法将prperty“innerHTML”设置为null，并且它说对于“document.getElementByIdcash3.innerHTML=rsCash+Gp；”行在switch语句中

switch (rsCash.toString().length) ...