如何用 this.function.bind(this) 中的参数替换任何数值

Question

class hoge{
    constructor(key) {
        this.Idx = require("./myIndex.json");
    }
    foo(id, concepts){
        var aFunction = {
            "one": this.selectAction.bind(this),
            "two": this.selectAction.bind(this)
    }
    selectAction(id, concepts, number){
        return (id + concepts + this.Idx[number])

    }

}

如何在 aFunction 方法的 this.selectAction.bind(this) 中仅用一个数字参数替换任何数值？例如， "one": this.selectAction.bind(这个, 数字 = 0); "two": this.selectAction.bind(这个, number = 1);

如果我这样写，return这个错误 ReferenceError: number is not defined

Answer 1

根据 bind documentation 你必须按顺序传递参数。

class hoge{
    constructor(key) {
        this.Idx = require("./myIndex.json");
    }
    foo(id, concepts){
        var aFunction = {
            one: this.selectAction.bind(this, id, concepts, 1),
            two: this.selectAction.bind(this, id, concepts, 2)
    }
    selectAction(id, concepts, number){
        return (id + concepts + this.Idx[number])
    }

}

如何用 this.function.bind(this) 中的参数替换任何数值

How can I substitute any numeric value for argument in this.function.bind(this)

javascript

bind

node.js