css CSS style declaration parent rule 属性

CSS style declaration parent rule 属性

原文:https://www . geesforgeks . org/csstyle declaration-parent rule-property/

parentRule 属性用于返回 表示包含选择器和声明块的 CSS 规则集的 CSS 规则对象。

语法:用于返回 parentRule 属性。

object.parentRule

返回值:返回 CSSRule 对象。

示例:要返回父规则属性:

<html>

<head>
    <title>
        CSS | Style Declaration parentRule Property
    </title>
    <style>
        body {
            text-align: center;
        }

        h1 {
            color: green;
        }

        #p1 {
            color: green;
            font-size: 20;
        }
    </style>
</head>

<body>
    <h1>
      GeeksforGeeks
  </h1>

    <p id="p1">
      parentRule Property
  </p>

    <p>
      Click the button to 
      return the parentRule property
  </p>

    <button onclick="myFunction()">
        Get parentRule
    </button>

    <p id="gfg"></p>
    <!-- Script to get parentRule property -->
    <script>
        function myFunction() {
            var x = 
                document.styleSheets[
                  0].rules[2].style.parentRule.cssText;
            document.getElementById("gfg").innerHTML = x;
        }
    </script>
</body>

</html>

输出: