Question

我在下面的代码示例中遇到了一些问题，请耐心等待，还是初学者

var currentGen = 1;
var totalGen = 19;
var totalMW = 0;

totalMW = 62;
while (currentGen <= 4){
//Add 62 to the number of generators, beginning with Generator #1
console.log("Generator #" + currentGen + " is on, adding 62 MW, for a total of " +    totalMW + " MW!");
totalMW = totalMW + 62;
currentGen++;
}

for (var currentGen = 5; currentGen <= totalGen; currentGen++){
//add 124 to generators #5 - 19
console.log("Generator #" + currentGen + " is on, adding 124 MW, for a total of " +  totalMW + " MW!");
totalMW = totalMW + 124;
}

打印第5代时，会打印

＆＃34;发电机＃5开启，增加124兆瓦，总计310兆瓦！＆＃34;

但我需要它从第4行添加124，但它增加了64而不是第5代的124。

我错过了什么？我应该在for循环之前进行计算吗？

Answer 1

试试这个：

var currentGen = 1;
var totalGen = 19;
var totalMW = 0;

while (currentGen <= 4){
//Add 62 to the number of generators, beginning with Generator #1
totalMW = totalMW + 62;
console.log("Generator #" + currentGen + " is on, adding 62 MW, for a total of " +    totalMW + " MW!");
currentGen++;
}

for (var currentGen = 5; currentGen <= totalGen; currentGen++){
//add 124 to generators #5 - 19
totalMW = totalMW + 124;
console.log("Generator #" + currentGen + " is on, adding 124 MW, for a total of " +  totalMW + " MW!");
}

这样你从零开始并在循环中执行所有添加。以前你在第一个循环之前将totalMW设置为62 ，然后在循环内再次递增总数 - 所以在前四次迭代之后你已经设置为62（实际上是Generator 1的一个增量）然后再增加四次，总共增加五个增量而不是四个增量。

Answer 2

[编辑]：

while (currentGen < 4){
//Add 62 to the number of generators, beginning with Generator #1
console.log("Generator #" + currentGen + " is on, adding 62 MW, for a total of " +    totalMW + " MW!");
totalMW = totalMW + 62;
currentGen++;
}

for (var currentGen = 4; currentGen <= totalGen; currentGen++){
//add 124 to generators #5 - 19
console.log("Generator #" + currentGen + " is on, adding 124 MW, for a total of " +  totalMW + " MW!");
totalMW = totalMW + 124;
}

试试这个。

Answer 3

以下是Working Fiddle：

使用

while (currentGen <= 4){
//Add 62 to the number of generators, beginning with Generator #1
console.log("Generator #" + currentGen + " is on, adding 62 MW, for a total of " +    totalMW + " MW!");
if(currentGen== 4) break;
totalMW = totalMW + 62;
currentGen++;
}

for (var currentGen = 5; currentGen <= totalGen; currentGen++){
//add 124 to generators #5 - 19
 totalMW = totalMW + 124;
console.log("Generator #" + currentGen + " is on, adding 124 MW, for a total of " +  totalMW + " MW!");

}

麻烦简单的While和For循环

3 个答案: