模拟器运行出现thirdScriptError 报错怎么解决？
代码是在网上找的一个贪吃蛇小程序，碰左右边框死没事，碰上下边框死就会报错
thirdScriptError
Cannot set property ‘21’ of undefined;at setInterval callback function
TypeError: Cannot set property ‘21’ of undefined
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代码是在网上找的一个贪吃蛇小程序，碰左右边框死没事，碰上下边框死就会报错
thirdScriptError
Cannot set property ‘21’ of undefined;at setInterval callback function
TypeError: Cannot set property ‘21’ of undefined