jquery:$.fn.extend扩展

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html部分


![4XXX_IHUPC{}5BH8Y`W[SMC.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/20b4dc3b757848b1b49373d8ff419571~tplv-k3u1fbpfcp-watermark.image?)

扩展部分


![A{IL2W2K%U@T9S[H~E~}(]B.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/b9b47183c98f44f8ba92a29c6844c241~tplv-k3u1fbpfcp-watermark.image?)