html原生js实现99乘法表

原生的js实现99乘法表实现选择下拉框颜色，改变背景颜色为选中的颜色

<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8" />

    <title>九九乘法表</title>

    <style>

        p {

            width: 100px;

            display: inline-block;

            padding: 10px;

            margin: 0;

            font-size: 20px;

            background-color: #FFFFFF;

            border-top: 1px solid black;

            border-right: 1px solid black;

        }

        div {

            display: block;

        }

        #zheng99 {

            width: auto;

            display: inline-block;

            border-left: 1px solid #000000;

            border-bottom: 1px solid #000000;

        }

        #group{

            display: block;

            margin-top: 20px;

            width: 200px;

            height: 50px;

            font-size: 20px;

        }

        #bianse{

            display: inline-block;

            width: 200px;

            height: 60px;

            margin-top: 20px;

            font-size: 20px;

        }

    </style>

</head>

<body>

<h1>9*9乘法表</h1>

<div id="zheng99"></div>

<select id="group">

    <option value="red">红色</option>

    <option value="yellow">黄色</option>

    <option value="green">绿色</option>

</select>

<button onclick="changeColor()" id="bianse">改变颜色</button>

</body>

<script>

    window.onload = function() {

        for(let i = 1; i <= 9; i++) {

            divs = document.getElementById("zheng99").innerHTML += "<div></div>";

            for(let j = 1; j <= i; j++) {

                document.getElementById("zheng99").getElementsByTagName("div")[i - 1].innerHTML +=

                    "<p>" + j + " x " + i + " = " + (j * i) + "</p>";

            }

        }

    };

    function changeColor() {

        let tag = document.getElementsByTagName('p');

        let select = document.getElementById('group');

        let index = select.selectedIndex;

        let group = select.options[index].value;

        for (let i = 0;i < tag.length; i++){

            tag[i].style.backgroundColor = group;

        }

    }

</script>

</html>

在这段代码中用到的修改i颜色的核心代码是

<select id="selectColor">

    <option value="red">红色</option>

    <option value="yellow">黄色</option>

    <option value="green">绿色</option>

</select>

function changeColor() {

        let tag = document.getElementsByTagName('p');

        let select = document.getElementById('group');

        let index = select.selectedIndex;

        let group = select.options[index].value;

        for (let i = 0;i < tag.length; i++){

            tag[i].style.backgroundColor = group;

        }

    }

　　小伙伴们可以自己试试

巴特西

html原生js实现99乘法表

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