条件catch子句 - 浏览器支持 [英] Conditional catch clauses - browsers support

问题描述

哪些浏览器支持有条件捕获条款？

在MDN try ... catch 你可以找到条件捕获子句为非标准功能。

On MDN try...catch you can find Conditional catch clauses as Non-standard feature.

try {
    myroutine(); // may throw three exceptions
} catch (e if e instanceof TypeError) {
    // statements to handle TypeError exceptions
} catch (e if e instanceof RangeError) {
    // statements to handle RangeError exceptions
} catch (e if e instanceof EvalError) {
    // statements to handle EvalError exceptions
} catch (e) {
    // statements to handle any unspecified exceptions
    logMyErrors(e); // pass exception object to error handler
}

注意：此功能不是ECMAScript规范的一部分。

Note: This functionality is not part of the ECMAScript specification.

任何现代浏览器都支持它？

It's supported by any modern browsers?

谷歌Chrome控制台返回未捕获语法错误：如果

Google Chrome's console returned Uncaught SyntaxError: Unexpected token if

意外令牌或者我使用：

Or shoud I use:

try {
    myroutine(); // may throw three exceptions
} catch (e) {
    if(e instanceof TypeError) {
        // statements to handle TypeError exceptions
    }
    else if(e instanceof RangeError) {
        // statements to handle RangeError exceptions
    }
    else if(e instanceof EvalError) {
        // statements to handle EvalError exceptions
    }
    else {
        // statements to handle any unspecified exceptions
        logMyErrors(e); // pass exception object to error handler
    }
}

推荐答案

你应该使用后者，因为它适用于所有地方，引用MDN

You should use the later one, as it works everywhere, quoting MDN

这里是如何实现的相同的条件捕获子句
仅使用符合ECMAScript
规范的简单JavaScript（显然它更详细，但无处不在（我在Firefox，IE和Chrome上测试过）），我有：

try {
    myroutine(); // may throw three types of exceptions
} catch (e) {
    if (e instanceof TypeError) {
        // statements to handle TypeError exceptions
    } else if (e instanceof RangeError) {
        // statements to handle RangeError exceptions
    } else if (e instanceof EvalError) {
        // statements to handle EvalError exceptions
    } else {
       // statements to handle any unspecified exceptions
       logMyErrors(e); // pass exception object to error handler
    }
}

第一个 catch（e如果e instanceof ..）仅适用于Mozilla Firefox，会在chrome和IE上出错

The first one catch (e if e instanceof ..) only works with Mozilla Firefox and gives errors on chrome and IE

Chrome

Uncaught SyntaxError: Unexpected token if

IE

SCRIPT1006: Expected ')'

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