Question

这是我使用 transcrypt -b -n -m （版本3.6.84）进行传输的python代码：

def test_1():
    console.log('before assert')
    assert False, "False fails"
    console.log('we should not see that if assert fails as expected')


def test_2():
    console.log('before assert')
    try:
        assert False, "False fails"
    except AssertionError as exception:
        console.log('we should see that since we catch the assertion error')
    console.log('after assert')

当我在浏览器控制台中运行test_1 / test_2时，我得到了一个奇怪的行为：

> mymodule.test_1()
before assert
we should not see that if assert fails as expected
<- undefined
> mymodule.test_2()
before assert
after assert
<- undefined

为什么没有使用assert引发异常？

Answer 1

来自issue 482的答案：

您需要-da开关来激活断言：

transcrypt -b -n -m -da

我测试过了：

def test_1():
    console.log('before assert')
    assert False, "False fails"
    console.log('we should not see that if assert fails as expected')

def test_2():
    console.log('before assert')
    try:
        assert False, "False fails"
    except AssertionError as exception:
        console.log('we should see that since we catch the assertion error')
    console.log('after assert')

try:    
    test_1()
except AssertionError as exception:
    console.log('we should see this')

test_2()

打印：

before assert
we should see this
before assert
we should see that since we catch the assertion error
after assert

Transcrypt中的许多内容都是可选的，以防止生成的JavaScript膨胀。某些功能由命令行开关控制：

http://www.transcrypt.org/docs/html/installation_use.html#available-command-line-switches

某些功能（也）由pragma（编译器指令）控制：

http://www.transcrypt.org/docs/html/special_facilities.html#the-pragma-mechanism

声称没有按预期工作

1 个答案: