数学解析器开发遇阻：JS对象参数处理及代码问题排查求助

First off, let's walk through some actionable steps to track down that elusive bug — since you're so close to finishing, it's likely a small oversight or unexpected interaction between your objects!

1. Fill & Validate Your Truncated Code #

The main.js snippet you shared cuts off at var pri... — I'm guessing that's where precedence handling kicks in, right? First, complete that section and add quick sanity checks:

• Double-check that all your constructor functions (clearingUnwantedCharacters, subgroupMarking, and the precedence-related one) are properly defined and accessible in your project.
• Add console.log statements after each parsing step to verify data flow:

  var cleared = new clearingUnwantedCharacters(textInput);
  console.log("After clearing unwanted chars:", cleared.output); // Confirm cleanup works
  var marked = new subgroupMarking(cleared.output);
  console.log("After subgroup marking:", marked.output); // Check if parentheses/subgroups are tagged correctly
  // Add a log for the precedence step once you fill in the code
  

2. Dig Into the Object Property Modification #

You mentioned an object that takes another object's property as a parameter and modifies it — this is a prime spot for bugs, especially if accidental mutation is happening. Try these checks:

• Verify if the modifying object is mutating the original property instead of returning a new value. For example, if you have code like this:

  function PropertyModifier(targetObj) {
    targetObj.value = targetObj.value.replace(/foo/g, ""); // Mutates the original object
  }
  

  Consider refactoring to return a modified copy instead (to preserve immutable state for parsing):

  function PropertyModifier(targetValue) {
    this.output = targetValue.replace(/foo/g, ""); // Returns a new modified value
  }
  

• Use console.dir() to inspect the state of your objects before and after the modification step — this will show you if properties are changing in unexpected ways.

3. Test Edge Cases to Narrow the Issue #

Math parsers often break on specific edge cases. Try feeding these inputs to see if you can replicate the problem consistently:

• Empty input or input with only whitespace
• Nested parentheses (e.g., ((2+3)*4)-5)
• Mixed precedence expressions (e.g., 2+3*4 vs (2+3)*4)
• Negative numbers or decimals (e.g., -5.2*3)

4. Check for Script Loading/Scope Issues #

Since you're using multiple JS files, ensure all your constructor functions are available in main.js:

• If using ES modules, confirm you're importing/exporting correctly (e.g., export class clearingUnwantedCharacters and import { clearingUnwantedCharacters } from './parser-utils.js').
• If loading scripts via <script> tags, make sure main.js loads after the files that define your parser objects — otherwise, you'll get "is not a constructor" errors.

If you can share the full code for the truncated main.js section and the property-modifying object, we can zero in on the exact issue even faster!

内容的提问来源于stack exchange，提问作者CreativeNameItIs