js中的语句

java语句与js的语句一样。
1.判断
if else/switch

<script type=text/javascript>
function fun1(){
    var num = 10;
    var num2 = 100;
    if(num1<num2)
    {
    alert("num1小");
    }
    else if(num1=num2)
    {
    alert("相等");
    }
    else
    {
    alert("num1大");
    }
}
fun1();
</script>

 

2.循环

for/while do/ do while

<script type=text/javascript>
function fun2()
{
    var count = 0;
    for(var i = 1; i<=100; i++)
    {    
        count += i;
    }
    alert(count);
}
fun2();
</script>