如何使用Map处理Dom节点

const person = {
    firstName: 'Alex', 
    lastName: 'MacArthur', 
    isACommunist: false
};

import { ref, watchEffect } from 'vue';

let rowStates = {};
let activeRow;

document.querySelectorAll('tr').forEach((row) => {
    // Set row state.
    rowStates[row.id] = ref(false);

    row.addEventListener('click', () => {
        // Update row state.
        if (activeRow) rowStates[activeRow].value = false;

        activeRow = row.id;

        rowStates[row.id].value = true;
    });

    watchEffect(() => {
        // Read row state.
        if (rowStates[row.id].value) {
            row.classList.add('active');
        } else {
            row.classList.remove('active');
        }
    });
});

import { ref, watchEffect } from 'vue';

- let rowStates = {};
+ let rowStates = new Map();
let activeRow;

document.querySelectorAll('tr').forEach((row) => {
-   rowStates[row.id] = ref(false);
+   rowStates.set(row, ref(false));

    row.addEventListener('click', () => {
-       if (activeRow) rowStates[activeRow].value = false;
+       if (activeRow) rowStates.get(activeRow).value = false;

        activeRow = row;

-       rowStates[row.id].value = true;
+       rowStates.get(activeRow).value = true;
    });

    watchEffect(() => {
-       if (rowStates[row.id].value) {
+       if (rowStates.get(row).value) {
            row.classList.add('active');
        } else {
            row.classList.remove('active');
        }
    });
});

const table = document.createElement('table');
document.body.append(table);

const count = 10_000;
for (let i = 0; i < count; i++) {
  const item = document.createElement('tr');
  item.id = i;
  item.textContent = 'item';
  table.append(item);
}

const rows = document.querySelectorAll('tr');
const times = [];
const testMap = new Map();
const testObj = {};

for (let i = 0; i < 1000; i++) {
  const start = performance.now();

  rows.forEach((row, index) => {
    // Test Case #1  
	// testObj[row.id] = index;
	// const result = testObj[row.id];

	// Test Case #2
	// testMap.set(row, index);
	// const result = testMap.get(row);
  });

  times.push(performance.now() - start);
}

const average = times.reduce((acc, i) => acc + i, 0) / times.length;

console.log(average);

<ul>
  <li id="item1">first</li>
  <li id="item2">second</li>
  <li id="item3">third</li>
</ul>

(async () => {
    const listMap = new WeakMap();

    // Stick each item in a WeakMap.
    document.querySelectorAll('li').forEach((node) => {
	listMap.set(node, node.id);
    });

    const registry = new FinalizationRegistry((heldValue) => {
	// Garbage collection has happened!
	console.log('After collection:', heldValue);
    });

    registry.register(document.getElementById('item2'), listMap);
    
    console.log('Before collection:', listMap);

    // Remove node, freeing up reference!
    document.getElementById('item2').remove();

     // Periodically create a bunch o' objects to trigger collection.
     const objs = [];
     while (true) {
   	for (let i = 0; i < 100; i++) {
            objs.push(...new Array(100));
	}

        await new Promise((resolve) => setTimeout(resolve, 10));
    }
})();