JavaScript 生成随机颜色JavaScript 生成随机颜色向下取整的随机数生成3个0-255中的随机数改变

代码

<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>生成随机颜色</title>
    <style>
        div {
            width: 100px;
            height: 100px;
            margin: 100px auto;
            border: 1px #777 solid;
            position: relative;
        }

        button {
            position: absolute;
            bottom: -50px;
            left: 0;
        }
    </style>
</head>

<body>
    <div><button>生成随机颜色</button></div>
    <script>
        
        var randomColor = function (obj) {
            var random = function (min, max) {
                return Math.floor(Math.random() * (max - min)) + min;
                //random(min,max) 向下取整的随机数
            }
            var r=random(0,255)
            var g=random(0,255)
            var b=random(0,255)
            obj.style.backgroundColor="rgb("+r+",+"+g+","+b+")"
            
        }

        var box=document.querySelector("div")
        var button=document.querySelector("button")
        button.onclick=function(){
            randomColor(box)
        }
        
    </script>
</body>

</html>

效果展示：

点击之后

再次点击

生成一个向下取整的随机数

                return Math.floor(Math.random() * (max - min)) + min;
                //random(min,max) 向下取整的随机数
            }

生成3个0-255之间的数rgb(r,g,b)，改变div的颜色

            var random = function (min, max) {
                return Math.floor(Math.random() * (max - min)) + min;
                //random(min,max) 向下取整的随机数
            }
            var r=random(0,255)
            var g=random(0,255)
            var b=random(0,255)
            obj.style.backgroundColor="rgb("+r+",+"+g+","+b+")"
            
        }