计算1-100之间不能被7整除的数的和

<script type="text/javascript">
			var b=0;
			for(var a=1;a<=100;a++){
				if(a%7!=0){
					b+=a;
				}
			}
			document.write(b);
		</script>

计算1-100之间能3整除的数的和

<script type="text/javascript">
			var b=0;
			for(var a=1;a<=100;a++){
				if(a%3==0){
					b+=a;
				}
			}
			document.write(b);
		</script>

求1-100之间所有偶数的和

<script type="text/javascript">
			var b=0;
			for (var a=1;a<=100;a++) {
				if(a%2==0) {
					b+=a;
				}
			}
			document.write(b);
		</script>

求1-100之间所有奇数的和

<script type="text/javascript">
			var b=0;
			for (var a=1;a<=100;a++) {
				if(a%2==1){
					b+=a;
				}
			}document.write(b);
		</script>

求1-100之间所有数的乘积

<script type="text/javascript">
			var b=1;
			for (var a=1;a<=100;a++) {
				b*=a;
			}
			document.write(b);
		</script>

求1-100之间所有数的和

<script type="text/javascript">
			var b=0;
			for(var a=1;a<=100;a++) {
				b+=a;
			}
			document.write(b);
		</script>

求1-100之间所有数的平均值

<script type="text/javascript">
			var b=0;
			var c=0;
			for(var a=1;a<=100;a++) {
				b+=a;
				c=b/100;
			}
			document.write(c);
		</script>

同时求1-100之间所有偶数和奇数的和

<script type="text/javascript">
			var a=0;
			var b=0;
			var c=0;
			for (var i=1;i<=100;i++) {
				if(i%2==0){
					a+=i;
				}else if(i%2==1){
					b+=i;
				}
			}c=a+b;
			document.write(c);
		</script>