引领#

初始化 led 类 #

使用以下构造函数创建一个 led 对象：

The led constructor creates an led object in the specified Three Wire Port:

范围	描述
`port`	The 3-Wire Port that the LED is connected to, whether it’s a port on the `Brain`, or a `3-Wire Expander`.

A Brain or 3-Wire Expander must be created first before they can be used to create an object with the led Class constructor.

// Create the Brain.
brain Brain;
// Construct an LED "LED" with the led class.
led LED = led(Brain.ThreeWirePort.A);

This LED object will be used in all subsequent examples throughout this API documentation when referring to led class methods.

The on() method turns the LED on.

**返回：**无。

// Turn on the LED.
LED.on();

// Wait 2 seconds.
wait(2, seconds.);

// Turn off LED.
LED.off();

The off() method turns the LED off.

**返回：**无。

// Turn on the LED.
LED.on();

// Wait 2 seconds.
wait(2, seconds);

// Turn off LED.
LED.off();