变颜色的九九乘法表
js代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>九九乘法表</title>
</head>
<body>
<script>
document.write(`<table width='550px' height='500px'>`);
for(var i =1;i<10;i++){
document.write("<tr>")
for(var j= 1;j<=i;j++){
//生成随机颜色的三个数
var r = Math.random()*255;
var g = Math.random()*255;
var b = Math.random()*255;
document.write("<td style='background:rgb("+r+","+g+","+b+")'>"+j+"*"+i+"="+(j*i)+"</td>")
}
document.write("</tr>")
}
document.write("</table>")
</script>
</body>
</html>