Question

我已设置了一个函数，以我想要的格式获取当前日期和时间：

function date(){
        var d = new Date();
        var minutes = d.getMinutes();
        var month = d.getMonth() +1;
        if(minutes<10){
            return (d.getDate() + "/" + month + "/" + d.getFullYear() + " " + d.getHours() + ":" + "0" + minutes);
        }else{
            return (d.getDate() + "/" + month + "/" + d.getFullYear() + " " + d.getHours() + ":" + minutes);}
        }

我创建了一个Object，其值为(amount,date,type)。如何设置它以使对象的每个新实例自动由函数date()生成日期值，以便在将其推送到数组movements时添加时间戳？

这是我的代码：

var movements =[];

//transactions
var initialBalance = new Transaction(1000,"date","cash");
var addIn = new Transaction(500,"date","cash");
var addOut = new Transaction(-300,"date","card");

//add the transactions to the movements array
movements.unshift(initialBalance);
movements.push(addIn);
movements.push(addOut);

我想用纯JS做这件事。

Answer 1

可能会将date函数添加到对象

var Transaction = function(amount, type) {

    this.date = (function() {
        var d = new Date();
        var minutes = d.getMinutes();
        var month = d.getMonth() +1;
        if (minutes<10) {
            return (d.getDate() + "/" + month + "/" + d.getFullYear() + " " + d.getHours() + ":" + "0" + minutes);
        } else {
            return (d.getDate() + "/" + month + "/" + d.getFullYear() + " " + d.getHours() + ":" + minutes);
        }
    })();

    // now deal with amount and type...
}

创建对象后，该函数将自行评估。

Answer 2

您可以覆盖数组上的推送...

var movements = [];
movements.push = function(transaction) {
    transaction.date = date();
    return Array.push(transaction);
};

Answer 3

您目前设置的方式，只需将"date"替换为date()的函数调用：

//transactions
var initialBalance = new Transaction(1000,date(),"cash");
var addIn = new Transaction(500,date(),"cash");
var addOut = new Transaction(-300,date(),"card");

但是，正如其他人所建议的那样，可能有更好的方法来做你想要做的事情。

如何将当前日期动态添加到对象的新实例并将其推送到数组

3 个答案: