我有这个数组:
super(props);
this.state = {
data: [{
baseCurrency: 'GBP',
baseAmount: 0,
convertToCurrency: 'USD',
rates: [],
currencies: []
},
]
}
当我尝试在render()函数中访问它时,它给了我错误
const {currency,rates,baseCurrency,baseAmount,convertToCurrency} = this.state.data;
const result = Number.parseFloat(baseAmount * rates [convertToCurrency])。toFixed(2);
如果我不使用数组声明this.state,则不会发生此问题。
您只能传播特定对象,因为它this.state.data
是一个数组:
const [
{ currencies, rates, baseCurrency, baseAmount, convertToCurrency },
] = this.state.data;
并且更具可读性:
const [firstItem] = this.sate.data;
const {
currencies,
rates,
baseCurrency,
baseAmount,
convertToCurrency,
} = firstItem;
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我来说两句