[英]How can I create a variable condition as a parameter in javascript?
我想測試輪盤游戲中連續出現多少紅色/黑色/偶數/奇數。
以下 function 將遍歷旋轉列表 n 並給出紅色連續贏和輸的次數。 相同的 function 可用於所有其他類型的偶贏，但支票不同
color[n[i]] == "red"
我想通過不同的支票進入這個 function 來測試偶數
n[i]%2 == 0
這可以做到嗎？
function test(n)
{
var wins = parseInt(0);
var losses = parseInt(0);
for(var i=0;i<n.length;i++)
{
if(color[n[i]] == "red")
{
wins += 1
losses = 0
}
else
{
wins = 0
losses += 1
}
}
.
.
.
第2部分
這是完整的代碼。 如果您單擊“輸入旋轉”按鈕和“切換數字鍵盤”按鈕，然后兩次添加數字 8，則會顯示 3 個警報。
我似乎無法讓 3 條消息顯示在不同的行上。 我嘗試了一些示例，但它總是在最后一條消息之前添加行返回。 你知道如何在不同的行上獲取多條消息嗎？
<html>
<head>
<style>
.bntcal {
padding: 10px 10px 10px 10px;
margin: 10px;
}
.bntcaladd {
padding: 10px 10px 10px 10px;
margin: 10px;
}
.bntshow{
padding: 5px 5px 5px 5px;
margin: 5px;
width: 10%;
}
.spanhide {
display: none;
}
.bell {
float:left;
display: none;
}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
var wheel0 = [37,32,15,19,4,21,2,25,17,34,6,27,13,36,11,30,8,23,10,5,24,16,33,1,20,14,31,9,22,18,29,7,28,12,35,3,26];
var wheel00 = [37,28,9,26,30,11,7,20,32,17,5,22,34,15,3,24,36,13,1,38,27,10,25,29,12,8,19,31,18,6,21,33,16,4,23,35,14,2];
var wheel = wheel00;
var wColor = "";
var numbers = [];
var color = [];
$(document).ready(function(){
// --- Menu Buttons
$("#enterSpins").click(function(){
$("#divSpins").show();
$("#divAlerts").hide();
$("#divHowTo").hide();
});
$("#setAlert").click(function(){
$("#divAlerts").show();
$("#divSpins").hide();
$("#divHowTo").hide();
});
$("#howTo").click(function(){
$("#divHowTo").show();
$("#divSpins").hide();
$("#divAlerts").hide();
});
// ---- Sub Buttons
$("#enterPad").click(function(){
$("#showSpinsPad").toggle();
$("#clearBox").toggle();
$("#clearBox1").toggle();
if(!$("#showSpinsPad").is(":hidden"))
{
$("#spins").prop("disabled", true)
}
else
{
$("#spins").prop("disabled", false)
}
});
$(".bntcal").click(function(){
$("#currentSpin").text($("#currentSpin").text()+$(this).val())
if ($("#currentSpin").text().length > 2)
{
$("#currentSpin").text($(this).val())
}
});
$("#clear").click(function(){
$("#currentSpin").text("")
});
$("#add").click(function(){
getWheel()
currentSpin = $("#currentSpin").text()
if(currentSpin.length > 0)
{
if ($("#spins").val().length > 0)
{
$("#spins").val($("#spins").val() + ", ");
}
if(parseInt(currentSpin)<37)
{
$("#spins").val($("#spins").val() + currentSpin);
}
if(parseInt(currentSpin) == 37)
{
$("#spins").val($("#spins").val() + "0");
}
if(parseInt(currentSpin) == 38)
{
$("#spins").val($("#spins").val() + "00");
}
if(parseInt(currentSpin)>38)
{
$("#spins").val($("#spins").val() + "0");
}
$("#currentSpin").text("")
}
var n = GetUserNumbers();
run(n)
});
$("#undo").click(function(){
var n = GetUserNumbers();
if (n.length>0)
{
n.pop();
}
$("#spins").val(n)
run(n)
});
$("#clean").click(function(){
$("#spins").val("")
});
$("#run").click(function(){
var n = GetUserNumbers();
run(n)
});
});
// ---------------------------------------------------------------
// --------------------- FUNCTIONS -------------------------------
// ---------------------------------------------------------------
function run(n)
{
$("#alert").text("")
// Evens
var conditions = ['color[n] == "red"','color[n] == "black"','n%2 == 0 && n<37','n%2 == 1 && n<37','n > 18 && n<37','n < 19 && n>0']
var checklocation = ['Red','Black','Even','Odd','High','Low']
var idWins = "#evenwin"
var idLosses = "#evenloss"
checkCondition(n, conditions, checklocation, idWins, idLosses)
// Dozens
var conditions = ['n%3 == 1','n%3 == 2','n%3 == 0','n>=1 && n<=12','n>=13 && n<=24','n>=25 && n<=36']
var checklocation = ['Row 1 [1,2,3..]','Row 2 [2,3,4..]','Row 2 [3,6,9..]','Dozen 1 [1-12]','Dozen 1 [13-24]','Dozen 1 [25-36]']
var idWins = "#dozenwin"
var idLosses = "#dozenloss"
checkCondition(n, conditions, checklocation, idWins, idLosses)
}
function checkCondition(n, conditions, checklocation, idWins, idLosses)
{
for(var i=0; i<conditions.length; i++)
{
var check = function(n){ if(conditions[i]){ return true; } else { return false; }}
var wins = checkWins(n, check)
var losses = checkLosses(n, check)
if(wins >= $(idWins).val()) { $("#alert").text($("#alert").text()+" "+checklocation[i]+" loses "+wins+" times in a rows.<br/>")}
if(losses >= $(idLosses).val()) { $("#alert").text($("#alert").text()+" "+checklocation[i]+" loses "+losses+" times in a rows.<br/>")}
}
}
function checkWins(n, condition)
{
var wins = parseInt(0);
for(var i=0;i<n.length;i++)
{
if(condition(n[i]))
{
wins += 1
}
else
{
wins = 0
}
}
return wins
}
function checkLosses(n, condition)
{
var losses = parseInt(0);
for(var i=0;i<n.length;i++)
{
if(condition(n[i]))
{
losses = 0
}
else
{
losses += 1
}
}
return losses
}
$.fn.multiline = function(text){
this.text(text);
this.html(this.html().replace(/\n/g,'<br/>'));
return this;
}
function getWheel()
{
if($("input[name=wheel]:checked").val()=="0")
{
wheel = wheel0
}
else
{
wheel = wheel00
}
color = GetColor(wheel)
}
function reset()
{
evenwins = parseInt(0);
}
function GetUserNumbers()
{
var n = $("#spins").val().split(",");
for(var x=0; x<n.length; x++)
{
if(n[x].trim() == "0")
{
n[x] = "37";
}
if(n[x].trim() == "00")
{
n[x] = "38";
}
n[x] = parseInt(n[x].trim());
}
return n;
}
function GetColor(wheel)
{
var color = Array();
if(wheel.length==37)
{
color[1] = "red";
color[2] = "black";
color[3] = "red";
color[4] = "black";
color[5] = "red";
color[6] = "black";
color[7] = "red";
color[8] = "black";
color[9] = "red";
color[10] = "black";
color[11] = "black";
color[12] = "red";
color[13] = "black";
color[14] = "red";
color[15] = "black";
color[16] = "red";
color[17] = "black";
color[18] = "red";
color[19] = "red";
color[20] = "black";
color[21] = "red";
color[22] = "black";
color[23] = "red";
color[24] = "black";
color[25] = "red";
color[26] = "black";
color[27] = "red";
color[28] = "black";
color[29] = "black";
color[30] = "red";
color[31] = "black";
color[32] = "red";
color[33] = "black";
color[34] = "red";
color[35] = "black";
color[36] = "red";
color[37] = "green";
}
if(wheel.length==38)
{
color[1] = "red";
color[2] = "black";
color[3] = "red";
color[4] = "black";
color[5] = "red";
color[6] = "black";
color[7] = "red";
color[8] = "black";
color[9] = "red";
color[10] = "black";
color[11] = "black";
color[12] = "red";
color[13] = "black";
color[14] = "red";
color[15] = "black";
color[16] = "red";
color[17] = "black";
color[18] = "red";
color[19] = "red";
color[20] = "black";
color[21] = "red";
color[22] = "black";
color[23] = "red";
color[24] = "black";
color[25] = "red";
color[26] = "black";
color[27] = "red";
color[28] = "black";
color[29] = "black";
color[30] = "red";
color[31] = "black";
color[32] = "red";
color[33] = "black";
color[34] = "red";
color[35] = "black";
color[36] = "red";
color[37] = "green";
color[38] = "green";
}
return color;
}
</script>
</head>
<body>
Toggle Displays</br><br/>
<div >
<button class="bntshow" id="enterSpins">Enter Spins</button><br/>
<button class="bntshow" id="setAlert">Set Alerts</button><br/>
<button class="bntshow" id="howTo">How To</button><br/>
<input type="radio" name="wheel" value="0">0 Wheel<br/>
<input type="radio" name="wheel" value="00" checked>00 Wheel<br/>
</div><br/>
<div id="alert"></div>
<hr>
<!-- Enter Spins -->
<span class="spanhide" id="divSpins">
<button class="bntcaladd" id="enterPad">Toggle Numberpad</button><br/>
<br/>
<span class="spanhide" id='showSpinsPad'>
<br/>
<button class="bntcal" id="calculator" value="0">0</button>
<button class="bntcal" id="calculator" value="00">00</button><br/>
<button class="bntcal" id="calculator" value="1">1</button>
<button class="bntcal" id="calculator" value="2">2</button>
<button class="bntcal" id="calculator" value="3">3</button><br/>
<button class="bntcal" id="calculator" value="4">4</button>
<button class="bntcal" id="calculator" value="5">5</button>
<button class="bntcal" id="calculator" value="6">6</button><br/>
<button class="bntcal" id="calculator" value="7">7</button>
<button class="bntcal" id="calculator" value="8">8</button>
<button class="bntcal" id="calculator" value="9">9</button><br/>
<button class="bntcaladd" id="clear">Clear</button>
<button class="bntcaladd" id="add">ADD</button><span id="currentSpin"></span>
<br/>
<button class="bntcaladd" id="undo">Undo</button><br/>
<span id="currentSpin"></span>
<br/>
</span>
<span id="clearBox">Enter roulette numbers separated by a comma</span><br/>
<textarea rows="10" cols="50" id="spins"></textarea><br/><br/>
<span id="clearBox1">
<button id="clean">Clear Box</button>
<button id="run">Run</button>
</span>
</span>
<!-- Set Alerts -->
<span class="spanhide" id="divAlerts">
<h2>Evens</h2>
<input type="text" id="evenwin" value="2"> Wins in a row<br>
<input type="text" id="evenloss" value="6"> Losses in a row<br>
<br><br>
<h2>Dozens</h2>
<input type="text" id="dozenwin" value="6"> Wins in a row<br>
<input type="text" id="dozenloss" value="6"> Losses in a row<br>
<br><br>
</span>
<!-- How To -->
<span class="spanhide" id="divHowTo">
How To
</span>
</body>
</html>
是的，一點沒錯！
在JavaScript中，您可以將函數保存到變量，然后將它們作為參數傳遞； 這是JavaScript最強大的方面之一。 因此，例如，如果要檢查顏色是否為紅色，則可以編寫條件測試函數，該函數返回true / false，如下所示：
var checkColor = function(nElement){
var color = color(nElement);
if(color == 'red'){
return true;
}
else if(color == 'black'){
return false;
}
}
因此，現在，您有了一個變量checkColor ，該函數可以檢查顏色是否為紅色。 現在，您可以像下面這樣將該函數傳遞到您的test函數中：
function test(n,testFunc)
{
var wins = parseInt(0);
var losses = parseInt(0);
for(var i=0;i<n.length;i++)
{
if(testFunc(n[i])) //testFunc = checkColor in this case since we passed in checkColor
{
wins += 1
losses = 0
}
else
{
wins = 0
losses += 1
}
}
test(n,checkColor); //This is where you pass in checkColor as your test func
因此，例如，如果我們想為偶數添加另一個測試，則可以這樣編寫一個函數：
var checkEven = function(nElement){
if(nElement % 2 == 0){
return true;
}
else{
return false;
}
}
我們可以使用以下新條件簡單地運行test ：
test(n,checkEven);
因此，從這里開始，您應該了解如何創建測試功能並將其傳遞給通用測試功能。 如果您需要澄清，請隨時詢問！
只需將條件傳遞為 function。
Javascript：
const myFunctionByCondition = (conditionFn) => {
const index = 10
if (conditionFn(index)) return "Condition applies"
return "Condition does not apply"
}
const val = myFunctionByCondition(i => i >= 10)
Typescript：
const myFunctionByCondition = (conditionFn: (i: number) => boolean) => {
const index = 10
if (conditionFn(index)) return "Condition applies"
return "Condition does not apply"
}
const val = myFunctionByCondition(i => i >= 10)
Javascript：如何創建一個函數 1. 接受一個全局變量作為參數 2. 改變該全局變量的值？
[英]Javascript: How can I create a function that 1. accepts a global variable as a parameter 2. alters the value of that global variable?
如果分配給它的新值滿足 javascript 中的預定義條件，我如何創建一個只能更改其值的變量？
[英]How can I create a variable that can only change its value if the new value to be assigned to it meets a predefined condition in javascript?
Javascript'Array'和'Loop'如何“變量[i]”成為一個條件
[英]Javascript ' Array ' and ' Loop ' how can “ variable[i] ” be a CONDITION
Javascript Calculator：如何根據條件創建操作員按鈕？
[英]Javascript Calculator: How can I create an operator button based on a condition?
如何在JavaScript中連接字符串和變量以創建新變量？
[英]How can i join a string and a variable to create a new variable in javascript?
在JavaScript中，如何創建一個帶有可選參數的function？
[英]In JavaScript, how can I create a function with an optional parameter?
如何為 javascript 中的inquirer.prompt 問題的答案創建 function 參數（變量）？ MySQL也參與
[英]How do I create a function parameter (variable) for the answers to an inquirer.prompt question in javascript? MySQL is also involved
如何在用作參數的函數中使用Javascript設置局部變量？
[英]How can i set a local Variable in Javascript in a function i used as parameter?
聲明:本站的技術帖子網頁，遵循CC BY-SA 4.0協議，如果您需要轉載，請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.