javascript - 如何在 Angular 中调用另一个函数内的函数

Question

我正在建立一个在线商店，我正在使用 paystack payment gateway ，在 api 中，我尝试在支付网关 api 内运行一个函数，但它不起作用。这是代码:

payWithPaystack(returnData, amount){
    const binded = this.service.completePayment.bind(this)
    var handler = PaystackPop.setup({
        key: '.......',
        email: this.details.email,
        amount: amount,
        currency: "NGN",
        ref: `ref-${Math.ceil(Math.random() * 10e13)}`, 
        metadata: {
            custom_fields: [{
                display_name: this.details.firstName+' '+this.details.lastName,
                variable_name: "mobile_number",
                value: this.details.phoneNumber
            }]
        },  
        callback(res){
            console.log(res)                
            binded(res);
        },
        onClose(){
            console.log('window closed');
            this.color='danger'
            this.payDisplay='Transaction closed'    
            this.payClick=false
        }
    });
    handler.openIframe();
}

在服务页面中，这是代码

completePayment(sentData){
    console.log('enter')
    this.http.post(`${this.ApiURL}payAm.php`, sentData, {headers:this.headers})
    .subscribe(data=>console.log('ok'), error=>console.log(error))
}

现在的问题是函数completePayment正在部分调用，console.log正在运行，但它没有发送http请求，请问我该如何解决这个问题

Answer 1

编写 payWithPaystack 方法，使其返回一个 promise :

payWithPaystack(amount){
    return new Promise( (resolve,reject) => {
        var handler = PaystackPop.setup({
            key: '.......',
            email: this.details.email,
            amount: amount,
            currency: "NGN",
            ref: `ref-${Math.ceil(Math.random() * 10e13)}`, 
            metadata: {
                custom_fields: [{
                    display_name: this.details.firstName+' '+this.details.lastName,
                    variable_name: "mobile_number",
                    value: this.details.phoneNumber
                }]
            },  
            callback(res){
                console.log(res)                
                //RESOLVE promise
                resolve(res);
            },
            onClose(){
                console.log('window closed');
                //REJECT promise
                reject('window closed');
            }
        });
        handler.openIframe();
    });
}

然后使用它返回的 promise :

this.payWithPaystack(amount)
 .then( sentData => {
    console.log('enter', sentData);
    this.http.post(`${this.ApiURL}payAm.php`, sentData, {headers:this.headers})
    .subscribe(data=>console.log('ok'), error=>console.log(error))
}).catch( reason => {
    console.log("rejected: ", reason);
    this.color='danger'
    this.payDisplay='Transaction closed'    
    this.payClick=false;
});

Promise 是链接异步操作的最佳方式。