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[英]How can mapStateToProps receive the updated state in react-redux implementation
[英]React-Redux: State updated but not copied
在我的减速器中,我无法理解为什么我的状态返回更新但未被复制。
const loginReducer = (state = {}, action) => {
let newstate = JSON.parse(JSON.stringify(state))
const { type, payload } = action
switch(type) {
case constant.LOGIN_SUCCESS:
//
newstate = { login: [{ user: payload.user, password: payload.password, logged: true }] }
console.log(newstate.login)
break;
default:
break;
}
return newstate
}
我想当然是一件简单的事情,但我无法弄清楚
似乎您在此行中完全重新分配了newstate
:
newstate = { login: [{ user: payload.user, password: payload.password, logged: true }] }
如果要保持当前值处于state
还需要包括它们:
newstate = { ...newstate, login: [{ user: payload.user, password: payload.password, logged: true }] }
上面使用了对象传播,您的babel配置中可能有也可能没有。 您还可以使用Object.assign
来实现相同的目的:
newstate = Object.assign(newstate, { login: [{ user: payload.user, password: payload.password, logged: true }] });
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