我假设我可以使用任何运算符来递增for循环中的递增变量。看起来并非如此。永远遵循以下代码循环。
import (
"fmt"
)
func main() {
for i:=0; i<10; i=i*2{
fmt.Println(i)
}
}
以下代码可以正常工作。
import (
"fmt"
)
func main() {
for i:=0; i<10; i=i+2{
fmt.Println(i)
}
}
答案 0 :(得分：6)
您的循环从function Cuser() {
var Us = document.getElementById("User").value;
if (Us.length < 7 || Us.length > 15) {
l1.innerHTML = "The username must be at least 7 characters and up to 15";
return false;
}
else if (Us == "" || Us == " " || Us == " " || Us == " " || Us == null) {
l1.innerHTML = "The username must be filled with at least 7 characters";
return false;
}
else {
l1.innerHTML = "Username is Valid";
return true
}
}
function Cemail() {
var Em = document.getElementById("mail").value;
var patt = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
if (Em == "" || Em == " " || Em == " " || Em == " " || Em == null) {
l1.innerHTML = "Please fill out the email";
return false;
}
else if (!patt.test(Em)) {
l1.innerHTML = "Please fill out the email correctly";
return false;
}
else {
l1.innerHTML = "email is valid";
return true;
}
}
function CheckPassword() {
var p = document.getElementById("pass1").value;
var p1 = document.getElementById("pass2").value;
var pattent = /[A-Z]/;
if (p == "" || p == " " || p == " " || p == " " || p == null) {
l1.innerHTML = "The password must be filled with at least 6 characters";
return false;
}
else if (p.length < 6 || p1.length > 12) {
l1.innerHTML = "Password min chars:6 Max chars:12";
return false;
}
else if (!p.match(pattent)) {
l1.innerHTML = "please include at least one capital letter"
return false;
}
else if (p1 != p) {
l1.innerHTML = "Passwords must be identical.";
return false;
}
else {
l1.innerHTML = "password is valid";
return true;
}
}
function checkPasswordStrenght() {
var x = document.getElementById("pass1").value;
if (x.length == 6) {
document.getElementById("strenght").value = "0";
}
if (x.length == 7) {
document.getElementById("strenght").value = "15";
}
if (x.length == 8) {
document.getElementById("strenght").value = "30";
}
if (x.length == 9) {
document.getElementById("strenght").value = "45";
}
if (x.length == 10) {
document.getElementById("strenght").value = "65";
}
if (x.length == 11) {
document.getElementById("strenght").value = "80";
}
if (x.length == 12) {
document.getElementById("strenght").value = "100";
}
}
function Cage() {
var Ag = document.getElementById("Age").value;
if (isNaN(Ag) == true || Ag == " " || Ag == "" || Ag == " ") {
l1.innerHTML = "Age must be a number.";
return false;
}
else if (Ag < 18) {
l1.innerHTML = "You must be an Adult to use this form";
return false;
}
else {
l1.innerHTML = "Age is valid";
return true;
}
}
function DisableMe() {
document.getElementById("butt").disabled = true;
}
function myCar() {
var checkBox = document.getElementById("myCheck");
var text = document.getElementById("text");
if (checkBox.checked == true) {
text.style.display = "block";
} else {
text.style.display = "none";
}
}
function myDegree() {
var checkBox = document.getElementById("myDeg");
var text = document.getElementById("Ddeg");
if (checkBox.checked == true) {
text.style.display = "block";
} else {
text.style.display = "none";
}
}
function myLangu() {
var checkBox = document.getElementById("myLang");
var text = document.getElementById("Llang");
if (checkBox.checked == true) {
text.style.display = "block";
} else {
text.style.display = "none";
}
}
function Checker() {
if (document.getElementById("GF").checked == false && document.getElementById("GM").checked == false) {
l1.innerHTML = "Please select your gender";
return false;
}
else {
return true;
}
}
function CChecker() {
var Cheddar = document.getElementById("myCheck").checked;
var Ham = document.getElementById("TypeOfCar").value;
if (Cheddar == true) {
if (Ham == "" || Ham == " " || Ham == " " || Ham == " " || Ham == null) {
l1.innerHTML = "Please Fill in the type of car you own";
}
}
else {
return true;
}
}
function LChecker() {
var Lettuce = document.getElementById("myLang").checked;
var Tomato = document.getElementById("TypeOfLang").value;
if (Lettuce == true) {
if (Tomato == "" || Tomato == " " || Tomato == " " || Tomato == " " || Tomato == null) {
l1.innerHTML = "Please Fill in at least one foreign language that you know";
}
}
else {
return true;
}
}
function DChecker() {
var Bread = document.getElementById("myDeg").checked;
var Mayo = document.getElementById("TypeOfDeg").value;
if (Bread == true) {
if (Mayo == "" || Mayo == " " || Mayo == " " || Mayo == " " || Mayo == null) {
l1.innerHTML = "Please Fill in at least one degree you own";
}
}
else {
return true;
}
}
function enableMe() {
if (Cuser() && Cemail && CheckPassword && Cage() && Checker() && CChecker() && LChecker() && DChecker()) {
document.getElementById("butt").disabled = false;
l1.innerHTML = "All credentials are valid";
return true;
}
else {
document.getElementById("butt").disabled = true;
}
}开始，因此您一直在不断执行<!DOCTYPE html>
<html>
<head>
<link rel="shortcut icon" type="image/x-icon" href="favicon.ico" />
<meta name="description" content="Form signup and php">
<meta name="keywords" content="Signup,html,php,react">
<meta name="author" content="Filippos Karagiannis">
<link href="StyleSheet.css" rel="stylesheet" />
<title>Exclusive Signup</title>
<script src="JavaScript.js"></script>
</head>
<body style="background-color:powderblue; text-align:center;" onload="DisableMe()">
<center>
<form action="react.html" display: inline - block;">
<fieldset class="center" style="width:50%; font-size:x-large; color:#383838;font-family:'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif">
<legend><b>Sign up form</b></legend>
<p>
<input type="text" id="User" name="Username" onchange="return Cuser()" placeholder="Type Username" />
</p>
<p>
<input type="email" id="mail" name="Email" onchange="return Cemail()" placeholder="e-Mail" />
</p>
<p>
<input type="password" id="pass1" name="Pass1"
placeholder="Password" onkeyup="checkPasswordStrenght(pass1), CheckPassword()" />
<input type="password" id="pass2" name="Pass2"
placeholder="Confirm Password" />
</p>
<div class="Strng">Password strenght:</div> <progress max="100" value="0" id="strenght" style="width:230px"></progress>
<p> <input type="text" id="Age" onchange="return Cage()" name="Age" placeholder="Type Age" /> </p>
<div class="Strng">
Male<input type="radio" id="GM" name="gender" value="male">
<input type="radio" id="GF" name="gender" value="female"> Female
</div>
<div class=" Strng">Do you own a car?<input type="checkbox" id="myCheck" onclick="myCar()"></div>
<div id="text" style="display:none"><input type="text" id="TypeOfCar" placeholder="Please inlcude the type of car" /></div>
<div class=" Strng">Do you know any other Languages<input type="checkbox" id="myLang" onclick="myLangu()"></div>
<div id="Llang" style="display:none"><input type="text" id="TypeOfLang" placeholder="Please inlcude the Languages" /></div>
<div class=" Strng">Do you own any postgraduate degrees<input type="checkbox" id="myDeg" onclick="myDegree()"></div>
<div id="Ddeg" style="display:none"><input type="text" id="TypeOfDeg" placeholder="Please inlcude the type of Degrees" /></div>
<p><div onmouseover="return enableMe()">Click Bellow to register your credentials</div></p>
<div onmouseover="return enableMe()">
<input class="button" id="butt" type="submit" value="Register">
</div>
<label class="Labbel" id="l1"></label>
</fieldset>
</form>
</center>
</body>
</html>，因此您将获得无限循环（如您应有的那样），因为i := 0和i := 0 * 2从不实际上变得更大。