Isn't rgb(255, 0, 0) red? There are three p tags with different background colors. Why only the first red one is returned?
益伦
益伦 2017-10-08 17:58:10
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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
    </script>
    <script>
        $(document).ready(function(){
            $("button").click(function(){
                alert("背景颜色 = " + $("p").css("background-color"));
            });
        });
    </script>
</head>
<body>
<h2>这是一个标题</h2>
<p style="background-color:#ff0000">这是一个段落。</p>
<p style="background-color:#00ff00">这是一个段落。</p>
<p style="background-color:#0000ff">这是一个段落。</p>
<button>返回 p 元素的 background-color </button>
</body>
</html>

Why is the returned result: background color = rgb(255, 0, 0)?

rgb(255, 0, 0) is not red. There are three p tags with different background colors. Why only the first red one is returned?


益伦
益伦

reply all(2)
环海如星

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">

</script>

<script>

$(document).ready(function(){

$("button").click(function(){

$("p").each(function(i){

alert($(this).css("background-color"));

})

                                                                                              ;body>

<h2>This is a title</h2>

<p style="background-color:#ff0000">This is a paragraph. </p>

<p style="background-color:#00ff00">This is a paragraph. </p>

<p style="background-color:#0000ff">This is a paragraph. </p>

<button>Returns the background-color of the p element </button>

</body>

</html>

should be written like this, because it will only take the first background-color of the value, and needs to loop through each!

ringa_lee

You need to traverse each

  • reply I don’t understand. Can you explain it in more detail? I just learned it.
    益伦 author 2017-10-09 19:26:11
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