大佬们，下面这句话怎么理解

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#1 Created at ... [Delete] [Delete and Lock User]

标题如上

function abs(x) {
    if (typeof x !== 'number') {
        throw 'Not a number';

#2 Created at ... [Delete] [Delete and Lock User]

加了一个防错，求绝对值要保证输入的参数是数字，所以if判断参数的数据类型是不是数字，不是的话直接返回“不是数字”，是的话继续执行下面的内容

#3 Created at ... [Delete] [Delete and Lock User]

这个“throw"是不是理解成”return“就行了？