let yourName;
do {
yourName = prompt("Who are you?");
} while (!yourName);
console.log(yourName);
在线教科书中给出了此代码:https://eloquentjavascript.net/02_program_structure.html
我也尝试过以这种方式在控制台中运行它:
let funGame;
do {
funGame = prompt("enter anything to get rid of this Game");
} while (!funGame);
console.log(funGame);
我正在使用谷歌chrome浏览器来测试这段代码。这段代码只运行一次,而它应该无限期地运行,直到提供一个空字符串。
;Do While";有效,直到条件成立。在您的情况下,代码希望您必须写一个名称才能从";"一边做";。
let yourName;
do {
yourName = prompt("Who are you?");
} while (!yourName);
console.log(yourName);
如果你不想要这种情况,但另一种情况,你可以删除"quot;在";Do while">
let yourName;
do {
yourName = prompt("Who are you?");
} while (yourName);
console.log(yourName);
在这种情况下,你会遇到相反的情况。
这里有一个简单的解决方案,yourName != null
检查提示是否被取消
let yourName;
do {
yourName = prompt("Who are you?");
} while (yourName != "" && yourName != null);
console.log(yourName);
您可以检查字符串的长度并运行循环,直到yourName
找到空白内容。
do {
var yourName = prompt("Who are you?");
console.log(yourName);
if (!yourName){
break;
}
} while (yourName.trim().length > 0);