json contains a large number of fields, and the backend cannot determine whether a certain field will be included in the json. It is not realistic to declare one by one at the front end, and the page that references no fields will report an error. How to solve such a situation?
/ / Please paste the code text below (do not replace the code with pictures)
all fields are fault-tolerant when taking values
var a = obj.b || ''ts or flow is recommended.
if it is inconvenient, the project can use its own detection method.
such as a.b | |'.
if your project is complicated, you can use jsonschema
var Validator = require('jsonschema').Validator;
var v = new Validator();
// Address, to be embedded on Person
var addressSchema = {
"id": "/SimpleAddress",
"type": "object",
"properties": {
"lines": {
"type": "array",
"items": {"type": "string"}
},
"zip": {"type": "string"},
"city": {"type": "string"},
"country": {"type": "string"}
},
"required": ["country"]
};if you find the two more troublesome, you can use some plug-ins to do these operations for you.
for example, your code is written like this:
obj.a.b.chelp you escape like this:
obj&& obj.a && obj.a.b && obj.a.b.cremove the backend, but sometimes the front end still has a
that handles the default values for those fields.Previous: Js regular substitution
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