STEP 8：矩形的宽度改变了一次，但不会继续改变。为什么不？
看看···· my_rect 。设置宽度（ 50 ） ¬ 。每次鼠标移动时， my_rect的宽度都会设置为 50，因此它永远不会再改变宽度！它总是 50。要改变宽度，我们需要使用一个改变的变量。我们将使用鼠标的 x 坐标，因为它会随着鼠标移动而改变。
To navigate the page using the TAB key, first press ESC to exit the code editor.
Your micro:bit is not set up for this program. Follow these steps to use your device with Codesters:
Your micro:bit has an old version of the Codesters binary file. Follow these steps to update the file on your micro:bit:
Warning: This will erase any existing program on your micro:bit.
Having trouble? Check out the micro:bit instructions to update your firmware.
Setting up your micro:bit
Calibrate your micro:bit by tilting it until all the LEDs are lit.
For a demonstration see the micro:bit calibration instructions.
Try the following steps to connect to your Micro:bit:
1. You may need to reload this page and try your program again.
2. Try disconnecting and reconnecting your Micro:bit. Then reload the page and run your program again.
3. If you are still having problems your Micro:bit may have an old firmware version that is incompatible with Codesters.
To update the firmware follow these Micro:bit instructions.
Are you already running a Codesters project in another tab or window?
Micro:bit can only connect to one web page at a time. Try stopping other Codesters projects or closing other tabs or windows that may be using your Micro:bit.
If that doesn't fix the problem try disconnecting your Micro:bit, reloading this page, and reconnecting your Micro:bit.
Status: Connected!
Status: Connecting...
Status: Still connecting...
Status: Failure
Status: Not Found
Is your Micro:bit connected?
