Stage Technical Summary (dva)

Create a new page

src/pages Folder, create a new page, the directory structure is as follows:

> Shipping
	> components
	> models
	index.jsx

Configuring Routing

config/config.jsIn accordance, pro exemplary configuration routes


The whole process of state management

这里指的是使用状态管理的整个思路,不是指代码的书写顺序,代码的书写过程应该是下面的倒序

The first step: @connect(() => ({}))adding before the assembly declared

Here is my habit to stateput the assembly, but not on modelthe

If stateplaced modelin @connect(() => ({})), the necessary received modelinstate

The second step: Each event must send a request to the backend, each event will triggerdispatch

Get dispatchthis method

const { dispatch } = this.props

dispatchusage of

dispatch({
	type: '[model文件名]/[effects中的方法]',
	payload: [传递参数],
	callback: res => { 
	  // 拿到 effects 方法中 callback 传回来的数据,做相应处理,这里我主要是把数据更新到 组件的 state 中
	  this.setState({
	  ...
	  })
	}
})

The third step: modelfile

modelThe main content of the file

export default {
  namespace: '[对应文件名]',
  state: {},

  effects: {},

  reducers: {
    // 如果下面 effects 方法中用到 yield put()
    // [对应方法](state, { payload }) {  // 第一个参数为,初始 state;第二个参数为,effects 中传递过来的 payload
    //   ...
    //   return {
    //   [经过修改后的 state]
    //   }
    // }
  },
};

effectsmethod

// 实例代码
*fetch({ payload, callback }, { call }) {
  const res = yield call(query, 'shipping', payload);
  // 如果 dispatch 有传过来一个 callback 的函数的话,调用这个 callback,把 res 作为参数传递,调用组件中的 callback  
  if (callback) callback(res);
  // 这里为什么是如果?因为可以用另一种方法代替 callback 的使用,就是 
  // yield put({ type: [reducers 中的方法], payload})
},

effectsMedium manneryield call()

import { [接口名] } from '@/services/api';

const res = yield call([接口名], '[接口参数]', payload);  // 第三个参数为详细参数,对应 services 文件中的 params

Fourth step: services/api.jsfile

import request from '@/utils/request';   // 调用接口请求
import { stringify } from 'qs';   // 字符串转换

export async function [接口名](resource, params) {   // 第一个参数,对用上面的 [接口参数]
  
  return request(`/api/${resource}?${stringify(params)}`);
}

The next step is to move bricks a pleasant ----

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Origin blog.csdn.net/JIANLI0123/article/details/103762502