// 99乘法表
/**
* 正三角
1 * 1 = 1
1 * 2 = 2 2 * 2 = 4
1 * 3 = 3 2 * 3 = 6 3 * 3 = 9
1 * 4 = 4 2 * 4 = 8 3 * 4 = 12 4 * 4 = 16
1 * 5 = 5 2 * 5 = 10 3 * 5 = 15 4 * 5 = 20 5 * 5 = 25
1 * 6 = 6 2 * 6 = 12 3 * 6 = 18 4 * 6 = 24 5 * 6 = 30 6 * 6 = 36
1 * 7 = 7 2 * 7 = 14 3 * 7 = 21 4 * 7 = 28 5 * 7 = 35 6 * 7 = 42 7 * 7 = 49
1 * 8 = 8 2 * 8 = 16 3 * 8 = 24 4 * 8 = 32 5 * 8 = 40 6 * 8 = 48 7 * 8 = 56 8 * 8 = 64
1 * 9 = 9 2 * 9 = 18 3 * 9 = 27 4 * 9 = 36 5 * 9 = 45 6 * 9 = 54 7 * 9 = 63 8 * 9 = 72 9 * 9 = 81
*/
// i 代表行，j 代表列
// 随着行 i 增大，列 j 逐渐增大
for (let i = 1; i <= 9; i++) {
let str = "";
for (let j = 1; j <= i; j++) {
str += `${j} * ${i} = ${i * j}\t`;
}
console.log(str);
}
console.log("===============");
/**
1 * 1 = 1
2 * 2 = 4 1 * 2 = 2
3 * 3 = 9 2 * 3 = 6 1 * 3 = 3
4 * 4 = 16 3 * 4 = 12 2 * 4 = 8 1 * 4 = 4
5 * 5 = 25 4 * 5 = 20 3 * 5 = 15 2 * 5 = 10 1 * 5 = 5
6 * 6 = 36 5 * 6 = 30 4 * 6 = 24 3 * 6 = 18 2 * 6 = 12 1 * 6 = 6
7 * 7 = 49 6 * 7 = 42 5 * 7 = 35 4 * 7 = 28 3 * 7 = 21 2 * 7 = 14 1 * 7 = 7
8 * 8 = 64 7 * 8 = 56 6 * 8 = 48 5 * 8 = 40 4 * 8 = 32 3 * 8 = 24 2 * 8 = 16 1 * 8 = 8
9 * 9 = 81 8 * 9 = 72 7 * 9 = 63 6 * 9 = 54 5 * 9 = 45 4 * 9 = 36 3 * 9 = 27 2 * 9 = 18 1 * 9 = 9
*/
// 随着行 i 增大，列 j 逐渐增大
for (let i = 1; i <= 9; i++) {
let str = "";
for (let j = i; j >= 1; j--) {
str += `${j} * ${i} = ${i * j}\t`;
}
console.log(str);
}
console.log("===============");
/**
* 倒三角
* 1 * 1 = 1 2 * 1 = 2 3 * 1 = 3 4 * 1 = 4 5 * 1 = 5 6 * 1 = 6 7 * 1 = 7 8 * 1 = 8 9 * 1 = 9
2 * 2 = 4 3 * 2 = 6 4 * 2 = 8 5 * 2 = 10 6 * 2 = 12 7 * 2 = 14 8 * 2 = 16 9 * 2 = 18
3 * 3 = 9 4 * 3 = 12 5 * 3 = 15 6 * 3 = 18 7 * 3 = 21 8 * 3 = 24 9 * 3 = 27
4 * 4 = 16 5 * 4 = 20 6 * 4 = 24 7 * 4 = 28 8 * 4 = 32 9 * 4 = 36
5 * 5 = 25 6 * 5 = 30 7 * 5 = 35 8 * 5 = 40 9 * 5 = 45
6 * 6 = 36 7 * 6 = 42 8 * 6 = 48 9 * 6 = 54
7 * 7 = 49 8 * 7 = 56 9 * 7 = 63
8 * 8 = 64 9 * 8 = 72
9 * 9 = 81
*/
// 随着行 i 增大，列 j 逐渐减少
for (let i = 1; i <= 9; i++) {
let str = "";
// 每遍历一行，增加两个制表符
for (let k = 1; k <= i; k++) {
str += `\t\t`;
}
for (let j = i; j <= 9; j++) {
str += `${j} * ${i} = ${i * j}\t`;
}
console.log(str);
}
标签：24,12,16,18,36,JS,99,乘法表 来源： https://www.cnblogs.com/beileixinqing/p/16353966.html
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