嘗試創建一個腳本,要求用戶輸入一系列正輸入,並在引入負輸入時結束。然後在警報中打印輸入的總和和平均值。任何想法爲什麼我在我的if語句中遇到錯誤?執行while循環時的JavaScript錯誤
var value;
var sum = 0;
var HTMLout;
var i = 0;
do {
if(isNaN(value) {
alert("Enter a positive integer");
} else {
value = parseInt(prompt("Enter a positive integer", "Enter a negative integer to quit"));
sum += value;
i++;
}
} while(value != -1);
HTMLout += alert("The sum of these numbers is " + sum);
HTMLout += alert("The average of these numbers is " + sum/i);
什麼樣的錯誤?請包括這些信息,這將有助於確定問題,謝謝! – plamut