The first code block does not include an import statement, which is required to use some of its methods and properties.

In terms of optimizations:

1. Avoid repeated string concatenation with replace(/[。.]+$/, ''), as the regex might cause performance issues. You can replace characters without replacement (re.sub) instead, making it faster.

export default {
  // ... other fields ...
};

2. Instead of using .el directly on <%= field %> inside method bodies, you should access this.$refs where available, or just specify element IDs if that would also work.
3. Use template literal strings (backtick syntax) rather than quotes around literals when constructing HTML elements. It's a bit more readable and maintains consistency across different environments like production and development servers.
4. In the setter for _cleanFormValue(), remove unnecessary double quotes from "iForm" variable names; they're redundant since they only contain single quotes.

For further improvements, consider these additional practices:

• Ensure consistent naming conventions within the same component. This avoids confusion between variables used differently at different points in your module.
• Consider breaking down larger blocks into smaller, reusable functions or components to enhance modularity.
• Implement static analysis tools to catch common pitfalls before writing actual functionality.

Remember that all changes I suggested require JavaScript updates, so remember to update your versions accordingly as necessary.