javascript - 对 iQuery 方法 .css() 使用多个值会抛出错误 : 'missing )' . 但是它不会丢失

Question

错误提示我缺少括号。但是语法与 w3Schools 和 Mozilla 相同。 .css() 在我只设置一种样式时有效，但在设置超过 1 个时会中断。

jQuery

 <script>
      $(document).ready( function(){

          // event-handler to create new element
          function createContainer() {

              // variables store values from <select> element
              var elementType = $('select').val();

              // string containing markup for use with .append()
              var elementTypeStr = $(` <${elementType}> This is a ${elementType} </${elementType}> `);
              // this throws error, while setting single style doesn't
              $('#layout_demo').append( elementTypeStr );
              elementTypeStr.css("background-color":" blue" , "height": "100px");

          } // end createContainer()

          // ---------------------------- event handlers ---------------------

          $('#btn').click( createContainer );
          // button to delete latest element or selected element

      }); // end ready

  </script>

HTML:

<section id="form">
  <!-- select element --->
  <label for="container"> Please select type of container to add</label>
  <select id= "container">
    <option value= "div" > &ltdiv&gt </option>
    <option value= "p"> &ltp&gt </option>
    <option value= "section"> &ltsection&gt </option>

  </select>
  <!-- Seperate container to hold now elements -->

  <button id="btn" > Create Container </button>
</section>

<div id="layout_demo">



</div>

Answer 1

使用 .css() 时，您有两种传递参数的选择:逗号分隔的字符串或对象文字表示法

因此:

.css("background-color", " blue").css("height", "100px");

或者更确切地说:

.css({backgroundColor:"blue" , height:"100px"});

此外，不要使用 $('select').val(); 使用更严格的选择器，例如某些 ID； 'select' 可以是您页面中的任何选择。

jQuery($ => {

  const createElement = () => {

    const tagName = $('#element').val();
    
    return $(`<${tagName}/>`, {
      appendTo: '#layout',
      text: `This is a ${tagName}`,
      css: {
        backgroundColor: "blue",
        height: "100px"
      },
    });

  }

  $('#create').on('click', createElement);

});

<section id="form">
  <label>
    Please select type of container to add
    <select id="element">
      <option value="div">&ltdiv&gt</option>
      <option value="p">&ltp&gt</option>
      <option value="section">&ltsection&gt</option>
    </select>
  </label>
  <button id="create">Create Container</button>
</section>
<div id="layout"></div>

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>