使用console.time
我正在使用 Google Closure Library 及其编译器创建一个应用程序。为了调试值，我使用console.log()。编译此文件将引发以下异常JSC_UNDEFINED_VARIABLE。变量 console 未在 ... 处声明。要解决此错误，我只需使用 window.console.log() 即可。
我还想测量一个函数所花费的时间。 Firebug 有两个很好的函数 console.time(name) 和 console.timeEnd(name) 可以很轻松地做到这一点。不幸的是，闭包编译器不支持这些函数，并抛出以下警告 JSC_INEXISTENT_PROPERTY。从未在 Window.prototype.console 上定义属性时间 ...。不幸的是，您无法通过添加 window 来解决此警告。
我也查看了该库，但 goog.debug.Console 没有我需要的功能。
我之前使用过的另一个解决方案如下所示。
var start = new Date();
// do something
var end = new Date();
// do some calculation to get the ms for both start and end
var startMS = ....;
var endMS = .....;
// get the difference and print it
var difference = (endMS - startMS) / 1000;
console.log('Time taken for something: ' + difference);
如果您经常使用它，代码有点太多，并且具有两个函数的版本会很棒：
window.console.time("timeTaken");
// do something
window.console.timeEnd("timeTaken");
这会打印出开始和结束之间的 MS。但如上所述，这不适用于闭包编译器。有谁有解决方案，我如何使用这两个函数window.console.time()和window.console.timeEnd()？或者可能是 goog.closure 提供的另一个解决方案，但我还没有找到？
I'm creating an application with Google Closure Library and its Compiler. To debug values I use console.log(). Compiling this will throw the following exception JSC_UNDEFINED_VARIABLE. variable console is undeclared at .... To solve this error, I just had to use window.console.log() instead.
I also want to measure the time that a function takes. Firebug has two nice functions console.time(name) and console.timeEnd(name) to do that very easily. Unfortunately the Closure Compiler does not support these functions throwing the following warning JSC_INEXISTENT_PROPERTY. Property time never defined on Window.prototype.console at .... Unfortunately you cannot solve this warning with prepending window.
I also had a look at the library, but goog.debug.Console has not the function that I need.
Another solution I have used before was something like the following
var start = new Date();
// do something
var end = new Date();
// do some calculation to get the ms for both start and end
var startMS = ....;
var endMS = .....;
// get the difference and print it
var difference = (endMS - startMS) / 1000;
console.log('Time taken for something: ' + difference);
This is a little bit too much code, if you use it very often, and the version with the two functions would be great:
window.console.time("timeTaken");
// do something
window.console.timeEnd("timeTaken");
This prints out the MS between start and end. But as mentioned above, this doesn't work with the closure compiler. Does anyone have a solution for this, how I can use these two functions window.console.time() and window.console.timeEnd()? Or maybe another solution that goog.closure provides, but I haven't found?
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您只需将它们添加到您正在使用的 extern 中即可。
You just need to added them to the externs you are using.
如果您不想/不能使用 extern，您可以轻松地使用基于字符串的属性引用“未声明”对象：
但是您必须小心，因为如果
time属性不存在或者不是函数。If you don't want to/can't use externs, you can easily reference "undeclared" objects with the string-based properties:
But you have to be careful, because the second line might throw an error if the
timeproperty does not exist or it's not a function.