:input

<form>
    <input type="button" value="Input Button"/>
    <input type="checkbox" />
    <input type="file" />
    <input type="hidden" />
    <input type="image" />
    <input type="password" />
    <input type="radio" />
    <input type="reset" />
    <input type="submit" />
    <input type="text" />
    <select><option>Option</option></select>
    <textarea></textarea>
    <button>Button</button>
</form>

jQuery 代码:

$(":input")

:checkbox

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HTML 代码:

<form>
  <input type="text" />
  <input type="checkbox" />
  <input type="radio" />
  <input type="image" />
  <input type="file" />
  <input type="submit" />
  <input type="reset" />
  <input type="password" />
  <input type="button" />
  <select><option/></select>
  <textarea></textarea>
  <button></button>
</form>

jQuery 代码:

$(":checkbox")