js for循环 写出乘法口诀
for (var i = 1; i <= 9; i++) {
for (var j =1 ; j <= i; j++) {
// document.write(i+"*"+j+"="+(i*j)+"<br/>")
if (j == i) {
document.write(j+"*"+i+"="+(i*j)+"<br/>")
}else{
document.write(j+"*"+i+"="+(i*j))
}
}
}