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我正嘗試使用React創建訂單列表/表單。 不過,點擊後的產品之一發生錯誤:React無法讀取屬性。它是否是錯誤的綁定?
無法讀取的不確定
13 | totalSum() {
14 | this.setState({
> 15 | total: this.state.total + this.product.price
16 | })
17 | }
是它在構造函數中錯誤綁定屬性「價格」?如果是的話,你能解釋我爲什麼嗎?
我的代碼:
import React, { Component } from 'react';
import Summary from './summary';
class ShoppingCard extends Component {
constructor(props) {
super(props);
this.state = {
total: 0
}
this.totalSum = this.totalSum.bind(this);
}
totalSum() {
this.setState = {
total: this.state.total + this.product.price
}
}
render() {
return (
<div>
{
products.map((product) => {
return (
<ul>
<li onClick={this.totalSum.bind(this)}>{product.name} {product.price}$</li>
</ul>
);
})
}
<Summary totalSum={this.totalSum}></Summary>
</div>
);
}
}
var products = [
{
name: "Product 1",
price: 250
},
{
name: "Product 2",
price: 70
},
{
name: "Product 3",
price: 140
},
{
name: "Product 4",
price: 640
},
{
name: "Product 5",
proce: 290
},
]
export default ShoppingCard;
你的情況沒有'this.product'這樣的東西。你是不是指'this.props.product'? – colburton