if语句中的for循环javascript
if语句中的for循环javascript
提问于 2020-11-17 14:07:18
有没有办法做到!radios.checked &&！radios1.检查&&！radios2.在循环中检查并在某些时候保持if条件不变？我的代码是：
function afterLogin(event){
event.preventDefault();
if((!radios[0].checked && !radios[1].checked && !radios[2].checked) || userName.value === "" || numOfQuestions.value === ""){
skillMsg.innerHTML = "Please check one of the skills before login";
isTrue = false;
}else{
title[0].innerHTML = "Welcome " + userName.value;
loginForm.style.display = "none";
calForm.style.display = "block";
formsColor.style.backgroundColor = color.value;
startTheGame();
isTrue = true;
}
}
这就是我想做的：
function afterLogin(event){
event.preventDefault();
for(let i = 0; i < radios.length; i++){
if(!radios[i].checked || userName.value === "" || numOfQuestions.value === ""){
//change the plase here
skillMsg.innerHTML = "Please check one of the skills before login";
return false;
}else{
title[0].innerHTML = "Welcome " + userName.value;
loginForm.style.display = "none";
calForm.style.display = "block";
formsColor.style.backgroundColor = color.value;
//return true;
startTheGame();
//return true;
}
}
}
回答 3
Stack Overflow用户
发布于 2020-11-17 14:14:31
试试这个？您可以使用可用的Array.every方法。参考：https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every
function afterLogin(event){
event.preventDefault();
if((!radios.every(radio => radio.checked) || userName.value === "" || numOfQuestions.value === ""){
skillMsg.innerHTML = "Please check one of the skills before login";
isTrue = false;
}else{
title[0].innerHTML = "Welcome " + userName.value;
loginForm.style.display = "none";
calForm.style.display = "block";
formsColor.style.backgroundColor = color.value;
startTheGame();
isTrue = true;
}
}Stack Overflow用户
发布于 2020-11-17 14:15:56
是的，这是可能的，创建一个不同的验证函数来执行健全性检查，或者在相同的函数中执行
function afterLogin(event){
event.preventDefault();
let notChecked = false;
for(let i = 0; i < radios.length; i++){
if(!radios[i].checked){
notChecked = true;
break;
}
}
if(notChecked || userName.value === "" || numOfQuestions.value === ""){
skillMsg.innerHTML = "Please check one of the skills before login";
isTrue = false;
}else{
title[0].innerHTML = "Welcome " + userName.value;
loginForm.style.display = "none";
calForm.style.display = "block";
formsColor.style.backgroundColor = color.value;
startTheGame();
isTrue = true;
}
}Stack Overflow用户
发布于 2020-11-17 14:16:35
是的，您可以使用every()函数来检查这一点。
var radios = [{checked: false}, {checked: false}, {checked: false}, {checked: false}];
if(radios.every(checkValue) || userName.value === "" || numOfQuestions.value === "") {
// your code
}
function checkValue({checked}) {
return checked === false;
}也要尝试使用干净的代码原则。就像尝试使用Fail first方法一样，使用if和return，这样您就不必在那里使用else块。只需将else部分放在if块之外。
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原文链接：
https://stackoverflow.com/questions/64870124
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