Javascript多个“尝试" [英] Javascript multiple "try"s

问题描述

我们都知道JS中的基本转义机制:

We all know the basic escaping mechanism in JS:

try {
    ...
}
catch(err) {
    ..
}

我有一个JSON数据，我想在其中检查销售线索是否具有全名.如果不是这样，请尝试使用名字和姓氏字段(实际上我也用硬编码在这里空格也是一个问题)组成一个字段，最后如果所有失败都显示"No Name".

I have a JSON data in which I want to check if a lead has a full name. If not, try to compose one with first and last name fields (I actually hard code a space there which is a problem as well.) and finally if all fails show "No Name".

或使用伪代码:

try {
    name = lead['Details']['Name']['Full'];
} else try {
    name = lead['Details']['Name']['First'] + " " + lead['Details']['Name']['Last'];
} catch (e) {
    name = "No Name";
}

有什么建议吗?

推荐答案

您可以将第二个try/catch块嵌套在第一个try/catch块的异常块中，如下所示:

You could nest your second try/catch block in the exception block of the first try/catch block as follows:

try {
    name = lead['Details']['Name']['Full'];
} catch(ex0) {      
  try {
      name = lead['Details']['Name']['First'] + " " + lead['Details']['Name']['Last'];
  } catch (ex1) {
      name = "No Name";
  }
}

这是有效的语法，在功能上等同于您的要求

This is valid syntax, and functionally equivalent to what you're requiring

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