[英]In React, how to pass “this.state” as parameter to “socket.on” callback function?
I am using Socket.io and React, and I have a function:我正在使用 Socket.io 和 React,我有一个 function:
this.state.socket.on("newMentions", function (data) {
this.setState({ // Cannot read "this" here.
newMentions: data
})
})
The socket
is store in state
of this class component, and I want to define its on
event, which should set some new date to the state by using this.setState
. socket
存储在此state
组件的 state 中,我想定义它的on
事件,它应该使用 this.setState 为this.setState
设置一些新日期。
But the this.setState
is inaccessible, I think I need to pass it as a paramete to the socket.on
function.但是
this.setState
是不可访问的,我想我需要将它作为参数传递给socket.on
function。 But how to do that?但是怎么做呢?
Thanks in advance!提前致谢!
You can use ES6 arrow function in order to access lexical context您可以使用 ES6 箭头 function 来访问词汇上下文
this.state.socket.on("newMentions",(data)=> {
this.setState({
newMentions: data
})
})
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