Object.keys中找不到狀態

Question

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() {...} 
} 

我在做什麼錯？

謝謝！

Answer 1

試試這個：

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

或更好，如果你有ES6：

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