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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no,minimal-ui">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-touch-fullscreen" content="no">
<link rel="shortcut icon" href="./favicon.ico">
<title>闷声抽大奖</title>
<script src="js/jquery-3.3.1.js"></script>
<script src="js/bootstrap.js"></script>
<script src="js/bootstrap.bundle.js"></script>
<link rel="stylesheet" href="css/bootstrap.min.css">
<link rel="stylesheet" href="css/bootstrap-grid.min.css">
<link rel="stylesheet" href="css/bootstrap-reboot.min.css">
</head>
<body>
<div class="jumbotron text-center">
<h1 class="display-3">闷声抽大奖</h1>
</div>
<div class="card m-3">
<div class="card-header">
<h4 class="card-title">配置</h4>
</div>
<div id="conf_div" class="card-body">
<div class="row">
<div class="col-lg-2 m-auto">
<label for="draw_amount" class="col-form-label">抽选数量</label>
<input id="draw_amount" type="number" step="1" value="10"
class="form-control d-inline" style="width: 5rem;">
</div>
<div class="col-lg-2 m-auto">
<input id="do_not_decrease" type="checkbox">
<label for="do_not_decrease">调试模式(不减库存)</label>
</div>
<div class="col-lg-2 m-auto">
<input id="sort" type="checkbox" checked>
<label for="sort">输出有序结果</label>
</div>
<div class="col-lg-4 m-auto">
<button id="reset_stock_btn"
class="btn btn-danger" onclick="resetStock()">复位库存
</button>
<button id="view_stock_btn" class="btn btn-info" onclick="viewStock()"
data-toggle="modal" data-target="#stockModal">
查看库存
</button>
<button class="btn btn-light"
data-toggle="modal" data-target="#infoModal">
帮助
</button>
</div>
</div>
<button id="draw_button" onclick="draw()"
class="btn btn-lg btn-block btn-primary mt-1">抽选
</button>
</div>
</div>
<div id="on_change_alert" class="alert alert-warning alert-dismissible fade hide m-3">
<button type="button" class="close" data-dismiss="alert">×</button>
<strong>注意!</strong> 自变更设置后您还未进行抽选。
</div>
<div class="card bg-dark text-white m-3" id="result_div">
<div class="card-header">
<h4 class="card-title">抽选</h4>
</div>
<div id="draw_result" class="card-body">
请配置抽选选项
<table class="table text-white">
<tbody>
<tr>
<td>此处显示结果</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="card bg-danger text-white m-3">
<div class="card-header">
<h4 class="card-title">调试</h4>
</div>
<div class="card-body">
<div class="form-group">
<input class="form-control d-inline m-auto" style="width: calc(100% - 10rem)"
id="console_input" type="text">
<button onclick="submitConsole()" class="btn btn-warning d-inline m-auto">提交</button>
</div>
<textarea class="form-control" disabled id="console_out" name="console_out" cols="30" rows="1">
</textarea>
</div>
<div class="card-body">
<button class="btn btn-info" onclick="retrieveJson()">获取JSON</button>
<button class="btn btn-danger" onclick="saveJson()">保存JSON</button>
<br>
<textarea class="form-control" id="json" name="console_out" cols="30" rows="10">
</textarea>
</div>
</div>
<div class="modal fade" id="stockModal">
<div class="modal-dialog modal-lg">
<div class="modal-content">
<!-- 模态框头部 -->
<div class="modal-header">
<h4 class="modal-title">奖品信息</h4>
<button type="button" class="close" data-dismiss="modal">×</button>
</div>
<!-- 模态框主体 -->
<div id="prize_info" class="modal-body">
</div>
<!-- 模态框底部 -->
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">关闭</button>
</div>
</div>
</div>
</div>
<div class="modal fade" id="infoModal">
<div class="modal-dialog modal-lg">
<div class="modal-content">
<!-- 模态框头部 -->
<div class="modal-header">
<h4 class="modal-title">闷声抽大奖(v2.7.1)帮助</h4>
<button type="button" class="close" data-dismiss="modal">×</button>
</div>
<!-- 模态框主体 -->
<div class="modal-body">
<p>第一次打开本工具时，这个帮助信息会自动弹出</p>
<h3>基本描述</h3>
<p>本工具为静态页面，初始的奖品信息保存在
<span class="text-primary">explanations.js</span>，您可以根据实际情况修改此文件</p>
<h3>自定义奖品(仅开发人员)</h3>
<p>使用在线托管服务时，您可能无法直接更改此文件，此时您可以使用浏览器调试台的
<span class="text-primary">localStorage</span>中的
<span class="text-primary">explanations</span>项（您可自行创建），以JSON数组格式保存奖品信息</p>
<p>例:</p>
<blockquote>
<pre>[
{
description:"奖品描述",
stock: 0, //初始库存
}
]</pre>
</blockquote>
<p>您也可以使用本工具末尾自带的调试工具进行奖品编辑</p>
<p>请留意
<button class="btn btn-danger">复位库存</button>
按钮将会使您本地存储的商品信息清空，从而重新使用
<span class="text-primary">explanations.js</span>，因此上述情况
<span class="text-danger">请不要使用</span>"复位库存"功能
</p>
<h3>本地存储</h3>
<p>每一次抽奖造成的库存变化都会保存在
<span class="text-primary">localStorage</span>中的
<span class="text-primary">explanations</span>项。点击
<button class="btn btn-danger">复位库存</button>
按钮将会清除保存的数据，从而恢复原本在
<span class="text-primary">explanations.js</span>
的奖品信息
</p>
<h3>小功能</h3>
<p><strong>调试模式</strong>勾选时，抽奖并不会影响库存，可用于测试</p>
<p><strong>输出有序结果</strong>勾选时，同一个奖品将会被排序在一起</p>
<p><strong>调试台</strong>您可以在此使用简易的console，以及获取和保存奖品的JSON（自动保存至localStorage）</p>
</div>
<!-- 模态框底部 -->
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">关闭</button>
</div>
</div>
</div>
</div>
<script src="explanations.js"></script>
<script>
String.prototype.replaceAll = function (s1, s2) {
return this.replace(new RegExp(s1, "gm"), s2);
};
let result_set = [];
let do_not_decrease = false;
let do_sort;
//从本地读取保存的库存信息
let t_explanations = localStorage.getItem("explanations");
if (t_explanations != null && t_explanations !== "") {
explanations = JSON.parse(t_explanations);
}
//弹出帮助
if (localStorage.getItem("first_2.7.0") != "false") {
$("#infoModal").modal("show");
localStorage.setItem("first_2.7.0", "false");
}
function draw() {
//初始化设置
result_set = [];
let draw_amt = parseInt($("#draw_amount").val());
if (isNaN(draw_amt) || draw_amt < 1) {
alert("抽选数量无效");
return;
}
let do_sort = $("#sort").is(":checked");
do_not_decrease = $("#do_not_decrease").is(":checked");
//检查库存
let total_stock = getTotalStock();
if (total_stock < draw_amt) {
alert("库存为" + total_stock + "，不足本次抽卡数量");
return;
}
//抽数进结果集(随机数在0至[库存-1]区间)
for (let i = 0; i < draw_amt; i++) {
let random = parseInt(Math.random() * total_stock);
//查重 重新生成直至不重复
while (checkRepetition(random)) {
random = parseInt(Math.random() * total_stock);
}
result_set.push(random);
}
//排序
if (do_sort)
result_set.sort(function (a, b) {
return a - b;
});
//生成表格，处理库存
let html = generateResultHtmlAndDecreaseStock(result_set);
saveExplanationsToLS();
$("#draw_result").html(html);
confChanged(false);
$("html, body").animate({
scrollTop: $("#result_div").offset().top,
}, 300);
}
function saveExplanationsToLS() {
localStorage.setItem("explanations", JSON.stringify(explanations));
}
function generateResultHtmlAndDecreaseStock(items) {
let indexes = [];
let html = "<table class=\"table text-white\">";
items.forEach(number => {
let index = getPrizeIndex(number);
indexes.push(index);
html += "<tr>" +
"<td>" + explanations[index].description + "</td>"
+ "</tr>"
});
if (!do_not_decrease)
decreaseStocks(indexes);
return html;
}
/**
* returns true if already exists
* @param number
*/
function checkRepetition(number) {
var flag = false;
result_set.some(function (element) {
if (element == number) {
flag = true;
return true;
}
});
return flag;
}
function getPrizeIndex(number) {
let result;
explanations.some(function (item, index) {
//边界条件: number==0 为第一个库存 则stock必须>number
if (item.stock > number) {
result = index;
return true;
}
//落在本商品的库存区间以外，减去目前数值，向下一个区间寻找
number -= item.stock;
});
return result;
}
function decreaseStocks(indexes) {
//先保存各index再降库存，否则getPrizeIndex(计算受影响)
indexes.forEach(function (i) {
explanations[i].stock--;
});
}
function getTotalStock() {
let total = 0;
explanations.forEach(function (item) {
total += item.stock;
});
return total;
}
function resetStock() {
localStorage.removeItem("explanations");
window.location.reload();
}
function viewStock() {
let total_stock = getTotalStock();
let html = "<table class='table table-striped table-responsive'>" +
"<thead class='w-100'>" +
"<tr>" +
"<th>品名</th><th>剩余库存</th><th>概率</th>" +
"</tr>" +
"</thead><tbody class='w-100'>";
explanations.forEach(function (item) {
html += "<tr><td>" +
item.description +
"</td>";
html += "<td>" + item.stock + "</td>";
html += "<td>" + ((item.stock * 100) / total_stock).toFixed(2) + "% </td>";
html += "</tr>";
});
html += "</tbody></table>";
$("#prize_info").html(html);
}
function confChanged(flag) {
let alert = $("#on_change_alert");
if (flag) {
alert.removeClass("hide");
alert.addClass("show");
} else {
alert.removeClass("show");
alert.addClass("hide");
}
}
function submitConsole() {
let script = $("#console_input").val();
$("#console_input").val("");
let out = $("#console_out");
if (script === "clear") {
out.val("");
out.attr("rows", 1);
return;
}
if (script === "larger") {
out.attr("rows", (parseInt(out.attr("rows")) + 5));
return;
}
try {
out.val(
out.val() + "\n" + eval(script)
);
} catch (err) {
out.val(
out.val() + "\n" + err
);
}
out.attr("rows", (parseInt(out.attr("rows")) + 1));
}
function retrieveJson() {
$("#json").val(JSON.stringify(explanations)
.replaceAll("\\},", "},\n")
.replaceAll("\\[", "[\n")
.replaceAll("\\]", "\n]"));
}
function saveJson() {
let json = $("#json").val();
explanations = JSON.parse(json.replaceAll("\n", ""));
saveExplanationsToLS();
alert("保存成功");
}
$(document).ready(function () {
$("#conf_div input").on("change", function () {
confChanged(true);
});
$("#console_input").keyup(function (e) {
if (e.keyCode === 13)
submitConsole();
});
});
</script>
</body>
</html>