for循环九九乘法表
for (var a=9; a<=9&&a>=1;a--) {
for (var j=1; j<=a;j++) {
document.write(j + "*" + a + "=" + a * j +";" +" ")
}
document.write("<br/>")
}
for (var a=9; a<=9&&a>=1;a--) {
for (var j=1; j<=a;j++) {
document.write(j + "*" + a + "=" + a * j +";" +" ")
}
document.write("<br/>")
}