谁帮我写一段程序啊！用JS求1-100之间的偶数之和的、、 谁能用js帮我写个 1-100的奇数和 和 偶数和
\u6c42javascript\u811a\u672c\u8bed\u8a00\u6c42\u51fa1\u5230100\u4e4b\u95f4\u6240\u6709\u5076\u6570\u4e4b\u548c\u7684\u4ee3\u7801\uff1f var sum = 0; //\u5b9a\u4e49\u4e00\u4e2a\u521d\u59cb\u503c\u4e3a0\u7684sum\u53d8\u91cf\u505a\u4e3a\u7d2f\u52a0\u5668 for(var i = 2;i
//\u5947\u6570\u548cvar oddSum=0;//\u5076\u6570\u548cvar evenSum=0;for(var i=1;i<=100;i++){ if(i%2==0) { evenSum+=i; } else { oddSum+=i; }}alert("100\u4ee5\u5185\u7684\u5947\u6570\u548c\uff1a"+oddSum);alert("100\u4ee5\u5185\u7684\u5076\u6570\u548c\uff1a"+evenSum);
var sunm = 0, i;for ( i = 1; i <= 100; i++ ){
if ( i % 2 == 0 ){
sunm += i;
}
}
说明：
js中，%符号是求余数，使用变量i去除以2得到的余数，如果余数为0，说明变量i能被2整除，那么他就是偶数
既然是偶数，就用初始值为0的变量sunm加上这个变量i
代码运行到了最后，变量sunm就是你要的结果
<script>
even=0;
for(var i = 2; i <= 100; i+=2){
even+=i;
document.write(i +"<br>");
}
document.write("1~100之间的偶数加起来等于:"+even+"<br>");
</script>
//这里是奇数
<script>
//正数1~99
odd=1;
for(var i = 1; i <= 100; i+=2){
odd+=i;
document.write(i +"<br>");
}
document.write("1~100之间的奇数加起来等于:"+odd+"<br>");
</script>
求1-99中的单数的和
<script>
//第一种方法
// var a = 0;
// for (var i = 1; i <= 99; i++) {
// if (i % 2 != 0) {
// a = a + i;
// }
// }
// alert('1到99单数的和是' + a);
//第二种方法
// var a = 0;
// for (var i = 1; i <= 99; i + 2) {
// a = a + i;
// }
// alert('1到99单数的和是' + a);
//第三种方法
var a = 0;
for (var i = 1; i <= 99; i++) {
if (i % 2 == 0) {
continue;//跳过本次循环的意思
}
a = a + i;
}
alert('1到99单数的和是' + a);
</script>
var res =0;
for(var i =2 ;i<=100; i+=2){
res + = i;
}
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