比较两个数的大小
if…else
var num1 = 7;
var num2 = 16;
if(num1 > num2){
alert(num1);
}else{
alert(num2);
}
判断一个年份是闰年还是平年
if…else
var year = 1997;
if(year % 4 == 0 && year % 100 != 0 || year % 400 == 0){
alert("是闰年");
}else{
alert("是平年");
}
看一个人是胖还是瘦,标准体重Standard
if…else
var Height = 190;
var weight = 180;
var Standard = (Height - 108) * 2;
if(Standard + 10 >= weight && Standard - 10 <= weight){
alert("正常");
}else if(Standard + 10 < weight){
alert("胖");
}else{
alert("瘦");
}
关于个人税应该交多少
if else
var tax = 0;
var money = 15000;
money -= 5000;
if(money <= 3000){
tax = money * 0.03;
}else if(money >= 3000 && money <= 12000){
tax = money * 0.1 - 210;
}else if(money >= 12000 && money <= 25000){
tax = money * 0.2 - 1410;
}else if(money >= 25000 && money <= 35000){
tax = money * 0.25 - 2660;
}else if(money >= 35000 && money <= 55000){
tax = money * 0.3 - 4410;
}else if(money >= 55000 && money <= 80000){
tax = money * 0.35 - 7160;
}else{
tax = money * 0.45 - 15160;
}
document.write(tax);
一百以内所有偶数的和
while
var i = 1;
var sum = 0;
while(i < 100){
if(i % 2 == 0){
sum += i;
}else{
document.write(i + "<br>");
}
i++;
}
alert(sum);
1000-2000年所有的闰年4个一行排列在网页上
while循环
var i = 1000;
var count = 0;//算有几个闰年
while(i <= 2000){
if(i % 400 == 0 || i % 4 == 0 && i % 100 != 0){
document.write(i + " ");
count++;
if(count % 4 == 0){
document.write("<br/>");
}
}
i++
}
for循环
var count = 0;
for(var i = 1000; i < 2000; i++){
if(i % 400 == 0 || i % 4 == 0 && i % 100 != 0){
document.write(i + " ");
count++;
if(count % 4 == 0){
document.write("<br/>");
}
}
}