某些代码仅在 chrome 调试器处于活动状态时才有效 [英] Some code only works while chrome debugger is active

问题描述

我正在开发一个 react-native 应用程序，我正在尝试使用 moment 格式化日期.

I'm working on a react-native application and I'm trying to format a date using moment.

日期看起来像02-16-2016 09:04:23"

Dates look like "02-16-2016 09:04:23"

function formatTime(date){

  var formattedDate = moment(date).format('MM:ss A');

  return formattedDate;
}

如果 chrome 调试器处于活动状态，则工作正常.但是如果我禁用它，我得到的只是无效日期"

Works fine if the chrome debugger is active. But if I disable it, all I get is "invalid date"

与我正在使用的解码功能相同

Same thing with a decoding function I'm using

var that = this;
MessagesService.getMessageBody(selectedMessage)
    .then(function(messageBody){

        var decodedData = window.atob(messageBody.messages);

        that.setState({
          messageBody: decodedData
        })
    })
    .catch(function(err){
        console.log(err);
    })

显示解码数据

<Text> Body: {this.state.messageBody} </Text>

并用

<View style = {[MessageStyles.senderItem, MessageStyles.date]}>
       <Text>
          {this.formatTime(message.createDateTime)}
       </Text>
</View>

也许这是在 React Native 中执行此操作的一种糟糕方法?仍在学习，所以我可能会做一些不好的练习.

Maybe this is a bad way to do this in react native? Still learning so I could be doing some bad practice.

推荐答案

我最近了解到在使用 chrome 调试器时，react native 使用不同的 JS 引擎.调试时使用 chrome JS 引擎，否则使用 JavaScriptCore.根据这篇文章

I learned recently that when using the chrome debugger, react native uses a different JS engine. The chrome JS engine is used during debugging, but JavaScriptCore is used otherwise. Per this article

http://ruoyusun.com/2015/11/01/things-i-wish-i-were-told-about-react-native.html

但对于日期的实际问题，JavaScriptCore 引擎似乎不喜欢用 - 解析日期.我不得不使用正则表达式将 - 替换为/，然后我的所有日​​期操作都可以正常工作.

But for the actual issue with the dates, the JavaScriptCore engine doesn't seem to like parsing dates with a -. I had to use a regex expression to replace the - with a / and then all my date manipulation worked fine.

02-16-2016 09:04:23 视为无效

02-16-2016 09:04:23 is considered invalid

02/16/2016 09:04:23 被认为是有效的

02/16/2016 09:04:23 is considered valid

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