killcerr

添加一些js基础有关内容

2

js在基岩版开发中占了很大比重，从行为包到服务端插件。 有必要添加一些关于其基础的内容。

https://github.com/AllayMC/Allay/blob/4c3e5aa278d965eee97ffa192620352229e27a76/README.md?plain=1#L86

old version of docs has item's ```Components``` but current version only has ```Item Definition Properties```

 [test.zip](https://github.com/user-attachments/files/19398831/test.zip)

Server packet parse error

10

127.0.0.1/50186 Deserialization failure for packet 0x7a. Packet buffer saved in ./1760188917254_packetReadError.txt as buffer was too large (323296 bytes). 127.0.0.1/50186 PartialReadError: Read error for undefined : undefined