[英]How can I pass variables to a new object in javascript?
I wish to implement this lib : 我希望实现这个lib :
var timer = new Tock({
this.callback: callbackFunction,
this.interval: 10,
this.complete: completeFunction,
});
However, I wish to be able to make dynamic calls: 但是,我希望能够进行动态调用:
var milkshake = my_milkshakes[next];
var timer = new Tock({
this.callback: makeMoreMilkshakes(), // (Call version 2)
this.interval: shakeTime,
this.complete: bringThemToTheYard
});
function bringThemToTheYard(){
return setNextCallbackFunction();
}
The problem here seems to be that I cannot reach outside the scope of the initialization. 这里的问题似乎是我无法达到初始化范围之外。 In Java, I can easily pass arguments to the constructor, except in the case when a function handle is expected.
在Java中,我可以轻松地将参数传递给构造函数,除非需要函数句柄。
By abstract I mean that the code is not reusable through reference, but this is admittedly loose terminology. 抽象是指该代码不可通过引用重用,但这是公认的宽松术语。
My goal is to initialize a single new
timer call to create new timers. 我的目标是初始化一个
new
计时器调用以创建新计时器。 I need 5 different timers. 我需要5个不同的计时器。 Ideally, a single timer would be enough because the timers are started and stopped in linear time.
理想情况下,单个计时器就足够了,因为计时器是在线性时间内启动和停止的。
My main problem is that I cannot set (for example) this.interval
to a dynamic variable x
, because I do not know how to pass a value into the constructor. 我的主要问题是我无法将
this.interval
设置为(例如)动态变量x
,因为我不知道如何将值传递给构造函数。
My implementation was based on the "code" from the documentation below: 我的实现基于以下文档中的“代码” :
var timer = new Tock({
countdown: true,
interval: 10,
callback: someCallbackFunction,
complete: someCompleteFunction
});
I'm not too sure you have a grasp on JavaScript and how much it really differs from Java - they are not that similar. 我不太确定您对JavaScript有什么了解,它与Java的真正区别是多少-它们并不相似。
This: 这个:
var timer = new Tock({
this.callback: makeMoreMilkshakes(), // (Call version 2)
this.interval: shakeTime,
this.complete: bringThemToTheYard
});
Doesn't work in JavaScript. 在JavaScript中不起作用。 That's a syntax error as you can't use dot notation (
.
) on the left-hand side of an object definition. 这是语法错误,因为您不能在对象定义的左侧使用点符号(
.
)。 It seems like maybe you want something like: 似乎您可能想要以下内容:
function Tock(config) {
var defaultCallback = callbackFunction;
var defaultInterval = 10;
var defaultComplete = completeFunction;
this.callback = config.callback || defaultCallback;
this.interval = config.interval || defaultInterval;
this.complete = config.complete || defaultComplete;
/**
* This could also be written as follows, I just wanted
* to emphasize how many people write "defaults" in JS
this.callback = config.callback || callbackFunction;
this.interval = config.interval || 10;
this.complete = config.complete || completeFunction;
*/
// Go on doing stuff....
}
var timer = new Tock({
callback: makeMoreMilkshakes(),
interval: shakeTime,
complete: bringThemToTheYard
});
Also, this line looks off: 此外,此行看起来也很:
callback: makeMoreMilkshakes(),
This is assigning the result of makeMoreMilkshakes
to the callback, not the function itself. 这是将
makeMoreMilkshakes
的结果分配给回调,而不是函数本身。 If that's intended, then never mind this bit. 如果这是故意的,那么请不要介意这一点。 But I think you want:
但我认为您想要:
callback: makeMoreMilkshakes,
without the ()
instead. 不使用
()
代替。
The solution I was looking for was this: 我一直在寻找的解决方案是:
function startNewTimer(type) {
var timer = new Tock({});
var options = null;
switch (type){
case "first":
options.callback = function1;
options.interval = interval1;
options.complete = startNewTimer(second);
break;
case "second":
options.callback = function2;
options.interval = interval2;
options.complete = startNewTimer(third);
break;
case "third":
options.callback = function3;
options.interval = interval3;
options.complete = startNewTimer(fourth);
break;
case "fourth":
options.callback = function4;
options.interval = interval4;
options.complete = startNewTimer(first); //Start over from function1
break;
}
timer.callback = options.callback;
timer.interval = options.interval;
timer.complete = options.complete;
timer.start(0);
out("Starting timer: ".concat(timer.callback));
}
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