一次函数

2024年03月12日

柏拉文

越努力，越幸运

一、认识

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二、实现

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JavaScript

function once(fn) {
    var called = false;
    return function () {
        if (!called) {
            called = true;
            fn.apply(this, arguments);
        }
    };
}
var pay = once(function (money) {
    console.log(`支付了 ${ money } RMB`);
});
pay(5);
pay(10);

TavaScript

function once<T extends (...args: any[]) => any>(fn:T):T{
    let called = false;
    return function(){
        if(!called){
            called = true;
            fn.apply(this,arguments as any);
        }
    } as any
}

const pay = once(function(money){
    console.log(`支付了 ${ money } RMB`);
});
pay(5);
pay(10)