意外令牌使用功能內功能

Question

下面的函數是在我的渲染函數之上，那有什麼問題？它似乎不允許我在功能內部放置功能。

onSelected(i){ 

    this.state.active = []; 
    this.state.active[i] = true; 

    generateRangeFromIndex(index,steps=20){ 
     return [index*steps, index*steps+steps] 
    } 

    this.setState({ 
     active: this.state.active, 
     showHandler: true, 
     selectedRange: generateRangeFromIndex(i) 
    }); 

} 

Answer 1

onSelected(i){ 

    this.state.active = []; 
    this.state.active[i] = true; 

    let t = this; 

    this.setState({ 
     active: this.state.active, 
     showHandler: true, 
     selectedRange: t.generateRangeFromIndex(i) 
    }); 

} 
generateRangeFromIndex(index,steps=20){ 
    return [index*steps, index*steps+steps] 
}