我如何在 React JS 中将数字从输入转换为 int

Question

import React, { Component } from 'react'
export default class Ccomponent extends Component {
    constructor(props) {
        super(props)
        this.state = {
            first: 0,
            second: 0,
            Otv: 0
        };
        this.firstChange = this.firstChange.bind(this);
        this.secondChange = this.secondChange.bind(this);
        this.Otvet = this.Otvet.bind(this);
        this.ConvertToInt = this.ConvertToInt.bind(this);
    }
firstChange(event){
    this.setState({
        first: event.target.value
    });
    this.Otvet()
}
secondChange(event){
    this.setState({
        second: event.target.value
    });
    this.Otvet()
}
Otvet(event){   
    this.setState({
        Otv: this.state.first+this.state.second
    });
    this.ConvertToInt();
}
ConvertToInt(event){
    var a = this.state.first;
    var b = this.state.second;
    let v = a+b //i can try use parceInt, error - 'parceInt' is not defined  no-undef
    console.log(v);
}
    render() {
        console.log(this)
        return(
            <div>
               <input type='number' value = {this.state.first} onChange={this.firstChange}/>
               <input type='number' value = {this.state.second} onChange={this.secondChange}/>
               <h3>Summa: {this.state.first}+{this.state.second}</h3>
               <h1>Otvet: {this.state.Otv}</h1>
            </div>
        )
}}

我的输入以字符串格式将值发送到对象，如果 parceInt 不起作用，我如何将 str 转换为 int。也许有一种方法可以获取 int 形式的值？或者 React 是否有将字符串转换为整数的内部函数？

Answer 1

parceInt() 拼写错误。小错别字。拼写为 parseInt() 试试看。

例如，

let str = "123"
let num = parseInt(str)
console.log(num) // 123

我如何在 React JS 中将数字从输入转换为 int

How i can converting numbers from input to int in react js

javascript

input

type-conversion

reactjs