<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>开课吧——九九乘法表</title>
<style>
body{
margin: 0;
font-size: 0;
}
div{
width: 120px;
height: 40px;
line-height: 40px;
text-align: center;
color: #fff;
margin-right: 2px;
margin-bottom: 2px;
border-radius: 5px;
background: lightcoral;
display: inline-block;
font-size: 16px;
}
.wrap{
background: url('./img/bg.jpg') no-repeat center;
height: 1067px;
overflow: hidden;
}
#box{
width: 1157px;
height: 436px;
background: linear-gradient(45deg,#dad4fa,#edebfd);
border-radius: 20px;
padding: 30px 0 0 30px;
box-sizing: border-box;
margin: 454px auto 0;
position: relative;
}
/*
'#78cc64','#58cd7e','#4fcdad','#4cc7dd','#469ee8','#465de8','#5846e8','#8346e8','#9e46e8'
*/
</style>
</head>
<body>
<section class="wrap">
<section id="box">
</section>
</section>
<script>
/*
1 * 1
1 * 2 2 * 2
1 * 3 2 * 3 3 * 3
1 * 4 2 * 4 3 * 4 4 * 4
*/
// var x = 1; 用j进行代替
// var y = 1; 用i进行代替
var box = document.getElementById('box');
var colors = ['#78cc64', '#58cd7e', '#4fcdad', '#4cc7dd', '#469ee8', '#465de8', '#5846e8', '#8346e8', '#9e46e8'];
var str = '';
for(var i = 1;i < 10;i++){
for(var j=1;j<=i;j++){
// console.log(j * i = ? )
// box.innerHTML += '<div>'+ j + ' * ' + i +'</div>'; 会产生性能的问题
str += '<div style="background:'+ colors[i - 1]+'">' + j + ' * ' + i + ' = '+ j*i + '</div>';
}
str += '<br/>';
}
box.innerHTML = str;
</script>
</body>
</html>
