类型错误：无法读取未定义的属性“文本”

Question

 constructor() { super() this.state = { privilegesOption: privilegesOption: [{ key: 1, text: "Admin", value: 1 }, { key: 2, text: "Cashier", value: 2 }] } this.foo = this.foo.bind(this) } foo() { let privilegesOut = this.state.privilegesOption.find(e => e.value === 1); console.log(privilegesOut.text) }

Why i keep get this error if i call object property after using.find? if i use this.state.privilegesOption[0].text, its worked

Answer 1

A few erros with this which is best answered with some space, I think what you were trying to do was this, I have turned privilegesOption into an array [] containing objects {} where the object key:value pairs are seperated by a comma ,

this.state = {
    privilegesOption: [
        {
            key: 1,
            text: "Admin",
            value: 1
        },
        {
            key: 2,
            text: "Cashier",
            value: 2
        }
    ]
}

And to find the object where value is 1 you were completely right

let privilagesOut = this.state.privilegesOption.find(x => x.value == 1)

Answer 2

Your posted code snippet has a syntax error (press "Run code snippet" to see it). Here is a complete code snippet with fixed syntax errors:

 class Y {} class X extends Y { constructor() { super(); this.state = { privilegesOption: [ { key: 1, text: "Admin", value: 1 }, { key: 2, text: "Cashier", value: 2 } ] }; let privilegesOut = this.state.privilegesOption.find(e => e.value === 1); console.log(privilegesOut.text); } } new X();

It successfully outputs "Admin" on the console.