grunt.registerTask中的异步任务 [英] Asynchronous tasks in grunt.registerTask

问题描述

我需要在grunt.registerTask中调用两个函数，但是必须在第一个函数完成后调用第二个函数.

I need to call two functions within grunt.registerTask, but the second function has to be called after the first function is done.

所以我想知道我们是否可以在grunt.registerTask中使用回调或Promise或其他异步机制.

So I was wondering if we can use callbacks or promises or other asynchronous mechanisms within grunt.registerTask.

(更具体地说，我需要在第一个函数调用中启动karma，并在第二个函数调用中运行karma(以执行初始单元测试).但是，要运行karma，我需要先启动它.那就是我所缺少的.)

(More specifically, I need to launch karma in my first function call, and run karma in the second function call (to execute the initial unit tests). But in order to run karma, I need to launch it first. And that's what I'm missing.)

推荐答案

我有这个:

grunt.registerTask("name_of_task", ["task_a", "task_b", "task_c"]);

"task_a"完成后必须执行"task_b".问题是"task_a"是异步的并立即返回，因此我需要一种方法使"task_a"具有几秒钟的执行时间.

And "task_b" had to be executed after "task_a" was done. The problem is that "task_a" is asynchronous and returns right away, so I needed a way to give "task_a" a few seconds to execute.

解决方案:

grunt.registerTask("name_of_task", ["task_a", "task_b:proxy", "task_c"]);

grunt.registerTask("task_b:proxy", "task_b description", function () {
        var done = this.async();

        setTimeout(function () {
            grunt.task.run("task_b");
            done();
        }, 2000);
    });
};

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