从时间戳开始经过的Javascript时间 [英] Javascript time passed since timestamp

问题描述

我试图通过将某些信息存储在变量中来缓存一些信息。

如果过了2分钟，我想得到实时值（调用url）。
如果2分钟没有通过，我想从变量中获取数据。

I am trying to "cache" some information by storing it in a variable.
If 2 minutes have passed I want to get the "live" values (call the url). If 2 minutes have not passed I want to get the data from the variable.

我基本上想要的是：

if(time passed is less than 2 minutes) {
    get from variable
} else {
    get from url
    set the time (for checking if 2 minutes have passed)
}

我是尝试计算时间，如

if((currentime + 2) < futuretime)

但它对我不起作用。
有人知道如何正确检查自上次执行代码后是否已经过去2分钟？

but it wouldn't work for me. Anybody know how to properly check if 2 minutes have passed since the last executing of the code?

TL; DR：想检查是否已经过了2分钟使用IF语句。

TL;DR: Want to check if 2 minutes have passed with an IF statement.

推荐答案

将算法转换为有效的javascript，你可以这样做：

Turning your algorithm into working javascript, you could do something like this:

var lastTime = 0;

if ( Math.floor((new Date() - lastTime)/60000) < 2 ) {
    // get from variable
} else {
    // get from url
    lastTime =  new Date();
}

你可以把 if 阻止函数，并在想要从变量或url获取信息的任何时候调用它：

You could put the if block in a function, and call it anytime you want to get the info from either the variable or the url:

var lastTime = 0;

function getInfo() {
    if ( Math.floor((new Date() - lastTime)/60000) < 2 ) {
            // get from variable
    } else {
        // get from url
        lastTime =  new Date();
    }
}

希望有所帮助。

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