[英]Calculating total not returning anything React
我正在使用 React 構建一個基本的商店應用程序。 所以在這里我有這個計算產品最終價格的函數。 代碼:
calculateTotal = () => {
const total2 =
this.state.final_apple_price +
this.state.final_avocado_price +
this.state.final_branzino_price +
this.state.final_bread_price +
this.state.final_burger_price +
this.state.final_carrot_price +
this.state.final_cheese_price +
this.state.final_chicken_price +
this.state.final_donut_price +
this.state.final_egg_price +
this.state.final_falooda_price +
this.state.final_milk_price +
this.state.final_muffin_price +
this.state.final_orange_price +
this.state.final_pizza_price +
this.state.final_potato_price +
this.state.final_salmon_price +
this.state.final_strawberry_price;
this.setState({ total: total2 });
};
該州有:
total: 0,
在這里它應該返回所有產品的值:
<h1>{this.state.total}</h1>
但是,即使添加了項目,h1 中也會顯示 0。
我在 calculateTotal 函數中嘗試的另一件事是 -
return total2;
和
<h1>{this.calculateTotal()}</h1>
盡管如此,它仍然無法正常工作。 怎么修? 謝謝
我想這就是第一條評論的意思。
calculateTotal = () => {
return this.state.final_apple_price +
this.state.final_avocado_price +
this.state.final_branzino_price +
this.state.final_bread_price +
this.state.final_burger_price +
this.state.final_carrot_price +
this.state.final_cheese_price +
this.state.final_chicken_price +
this.state.final_donut_price +
this.state.final_egg_price +
this.state.final_falooda_price +
this.state.final_milk_price +
this.state.final_muffin_price +
this.state.final_orange_price +
this.state.final_pizza_price +
this.state.final_potato_price +
this.state.final_salmon_price +
this.state.final_strawberry_price;
};
// ...
// inside render
`<h3>{this.calculateTotal()}</h3>`
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