javascript - 在 Object.keys 中找不到状态

Question

这个问题已经有答案了:

How to access the correct `this` inside a callback (15 个回答)

How do I get the right "this" in an Array.map? (5 个回答)

已关闭 4 年前。

render() {
    console.log(this.state.myStateValue); // I see this on the console
    var test = configOptions ? 
    Object.keys(configOptions).map(function(key) {
        console.log('test'); // I see this on the console
        console.log(this.state.myStateValue);  // Getting Uncaught TypeError: Cannot read property 'state' of undefined
    }
    return() {...}
}

我做错了什么？

谢谢!

Answer 1

试试这个:

Object.keys(configOptions).map(function(key) {
    console.log('test'); 
    console.log(this.state.myStateValue); 
}.bind(this))

或者更好，如果你有ES6:

Object.keys(configOptions).map((key) => {
    console.log('test');
    console.log(this.state.myStateValue); 
})