<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="div1"></div>
<div id="div2"></div>
<div id="div3"></div> <script>
/*
* 用 三种循环语句写出九九乘法表
* for; while do ;do while;
* */ /*
* 方法一
* */
var oDiv1=document.getElementById('div1');
for (var nFirstNum1 = 1; nFirstNum1 < 10; nFirstNum1++) {
for (var nSecNum1 = 1; nSecNum1 <= nFirstNum1; nSecNum1++) {
oDiv1.innerHTML+=nFirstNum1+'*'+nSecNum1+'='+nFirstNum1*nSecNum1+' ';
}
oDiv1.innerHTML+="<br/>";
}
/*
* 方法二
* */
var oDiv2=document.getElementById('div2');
var nFirstNum2=1;
while(nFirstNum2<10){
var nSecNum2=1;
while(nSecNum2<=nFirstNum2){
oDiv2.innerHTML+=nFirstNum2+'*'+nSecNum2+'='+nFirstNum2*nSecNum2+' ';
nSecNum2++;
}
oDiv2.innerHTML+="<br/>";
nFirstNum2++;
}
/*
* 方法三
* */
var oDiv3=document.getElementById('div3');
var nFirstNum3=1;
do{
var nSecNum3=1;
do{
oDiv3.innerHTML+=nFirstNum3+'*'+nSecNum3+'='+nFirstNum3*nSecNum3+' ';
nSecNum3++;
}while(nSecNum3<=nFirstNum3)
oDiv3.innerHTML+="<br/>";
nFirstNum3++;
}while(nFirstNum3<10)
</script>
</body>
</html>