JavaScript 嵌套尝试异常

Question

我正在阅读 JavaScript exceptions:

You can nest one or more try...catch statements. If an inner try...catch statement does not have a catch block, the enclosing try...catch statement's catch block is checked for a match.

我认为我理解正确并编写了如下测试代码：

try {

    try {
        throw "error";
    }

} catch( e ) {

    console.log( e );

}

但是出现这个错误：

Uncaught SyntaxError: Missing catch or finally after try

我知道它清楚地表明我遗漏了一个问题或最后但 JavaScript 文档说我的代码应该有效还是我误解了？

Answer 1

引用的文字具有误导性，因为它说 "if an inner try..catch doesn't have a catch block" 没有任何意义。它应该只是 "if an inner try doesn't have...".

在 JavaScript 中，您不能单独拥有一个 try；它有有 catch、finally，或两者都有。所以引用的场景是 try/catch 包含 try/finally（不是另一个 try/catch）：

try {
    try {
        throw "error";
    }
    finally {
    }
} catch( e ) {
    console.log( e );
}

Answer 2

此处指定：(https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Statements/try...catch)

The try statement consists of a try block, which contains one or more statements, and at least one catch clause or a finally clause, or both. That is, there are three forms of the try statement:

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