JavaScript 包括方法

Question

Could someone take a look at this and help me out? I've been working on it for a little while now and can't figure out what I'm missing.

I'm trying to set the inner HTML of a DOM element based upon the presence of a code within the message value of this response object

{
  error: "{\"code\":-1121,\"msg\":\"Invalid symbol.\"}"
  message: "400 - \"{\\\"code\\\":-1121,\\\"msg\\\":\\\"Invalid symbol.\\\"}\""
  name: "StatusCodeError"
  statusCode: 400
}

 const data = await res.json(); if (data.statusCode == 400) { let parsedData = data.toString(); if (parsedData.includes('1121')) { statusMessage.className = 'alert alert-danger text-center err-message'; statusMessage.innerHTML = 'Invalid symbol.' } }

Answer 1

data.error is JSON, you should parse it and then check the code property.

 const data = await res.json(); if (data.statusCode == 400) { let error = JSON.parse(data.error); if (error.code == -1121) { statusMessage.className = 'alert alert-danger text-center err-message'; statusMessage.innerHTML = error.msg; } }

Answer 2

Before you parsed the data transform it to JSON format.

let parsedData = JSON.parse(data.error);

Check for a specific property code by using dot notation

if(parsedData.code === -1121))

Answer 3

The parsedData checked should be the message not the whole data

 var data={ error: "{\"code\":-1121,\"msg\":\"Invalid symbol.\"}", message: "400 - \"{\\\"code\\\":-1121,\\\"msg\\\":\\\"Invalid symbol.\\\"}\"", name: "StatusCodeError", statusCode: 400, } if (data.statusCode == 400) { let parsedData = data.message.toString(); if (parsedData.includes('1121')) { console.log('alert alert-danger text-center err-message'); console.log('Invalid symbol.')} }