使用input事件，它在输入字段接收到任何输入时触发。
这实际上是一个微不足道的操作，在JQuery中并没有变得简单得多。此外，你应该使用CSS类，而不是使用内联样式，因为内联样式更难以覆盖，并可能导致代码重复。
将下面的代码放在<script>元素中，并将该元素放在关闭的body标记之前，就完成了。

// Get a reference to the element where the message will be
// FYI: A label is not meant for this.
const output = document.querySelector(".hidden");

// Set up an input event handler on the input field
// The event will trigger as any kind of input happens to the field
document.querySelector(".foo").addEventListener("input", function(e) {
  // All values that come from HTML are strings.
  // Prepending that string with + implicitly converts it to a number
  if(+this.value > 0){
     // Remove the hidden CSS class to reveal element
     output.classList.remove("hidden");
  } else {
     // Apply the hidden CSS class to hide the element
     output.classList.add("hidden");
  }
});

/* When possible, use CSS classes instead of  inline styles. */
.hidden { display:none; }

<input class="foo" type="number">
<div class="hidden">Message Here</div>

请保持一致-使用纯JS或jQuery，请不要混合使用。
jQuery

$(function() {
  $('.totalsTeal').on('input', function() {
    console.log(this.value, this.value === '0.00')
    const day = $(this).data('name');
    $('#w1_' + day).closest('.parentDiv').find('label')
      .toggle(+$(this).val() !== 0)
  }).trigger('input');
});

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香草JS

window.addEventListener('DOMContentLoaded', () => {
  const container = document.getElementById('container')
  container.addEventListener('input', (e) => {
    const tgt = e.target.closest('.totalsTeal'); // in case it has children
    if (!tgt) return; // not a .totalsTeal or child thereof
    const day = tgt.dataset.name;
    console.log(day,`w1_${day}`)
    document.getElementById(`w1_${day}`).closest('div').querySelector('label').hidden = +tgt.value !== 0;
  });
  container.querySelectorAll('.totalsTeal').forEach(inp => {
    console.log(inp.value)
    inp.dispatchEvent(new Event('input', {
      bubbles: true,
      cancelable: true
    }));
  });
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.0/jquery.min.js"></script>
<div id="container">
  <div class="parentDiv">
    <input class="totalsTeal" type="number" value="0.00" data-name="x">
    <span id="w1_x">Not sure what wl is</span>
    <label hidden>Message Here</label>
  </div>
  <div class="parentDiv">
    <input class="totalsTeal" type="number" value="1.00" data-name="y">
    <span id="w1_y">Not sure what w1 is</span>
    <label hidden>Message Here</label>
  </div>
  <div class="parentDiv">
    <input class="totalsTeal" type="number" value="2.00" data-name="z">
    <span id="w1_z">Not sure what w1 is</span>
    <label hidden>Message Here</label>
  </div>
</div>

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