完整代码示例<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <style> * { box-sizing: border-box; } body { background-color: #f1f1f1; } #regForm { background-color: #ffffff; margin: 10px auto; font-family: Raleway; padding: 10px; width: 90%; min-width: 300px; } h1 { text-align: center; } input { padding: 10px; width: 100%; font-size: 17px; font-family: Raleway; border: 1px solid #aaaaaa; } /* Mark input boxes that gets an error on validation: */ input.invalid { background-color: #ffdddd; } /* Hide all steps by default: */ .tab { display: none; } button { background-color: #04AA6D; color: #ffffff; border: none; padding: 10px 20px; font-size: 17px; font-family: Raleway; cursor: pointer; } button:hover { opacity: 0.8; } #prevBtn { background-color: #bbbbbb; } /* Make circles that indicate the steps of the form: */ .step { height: 15px; width: 15px; margin: 0 2px; background-color: #bbbbbb; border: none; border-radius: 50%; display: inline-block; opacity: 0.5; } .step.active { opacity: 1; } /* Mark the steps that are finished and valid: */ .step.finish { background-color: #04AA6D; } .autocomplete { position: relative; display: inline-block; } .autocomplete-items { position: absolute; border: 1px solid #d4d4d4; border-bottom: none; border-top: none; z-index: 99; /*position the autocomplete items to be the same width as the container:*/ top: 100%; left: 0; right: 0; } .autocomplete-items div { padding: 10px; cursor: pointer; background-color: #fff; border-bottom: 1px solid #d4d4d4; } .autocomplete-items div:hover { /*when hovering an item:*/ background-color: #e9e9e9; } .autocomplete-active { /*when navigating through the items using the arrow keys:*/ background-color: DodgerBlue !important; color: #ffffff; } </style> <body> <form id="regForm" action="/submit_page.php"> <h1>Your Nutrition Needs:</h1> <div class="tab">Your Fruit: <p class="autocomplete"> <input id="myFruitList" type="text" name="fruit" placeholder="Start typing your fruit name"></p> </div> </form> <script> function fruitautocomplete(inp, arr) { /*the autocomplete function takes two arguments, the text field element and an array of possible autocompleted values:*/ var currentFocus; /*execute a function when someone writes in the text field:*/ inp.addEventListener("input", function(e) { var a, b, i, val = this.value; /*close any already open lists of autocompleted values*/ closeAllLists(); if (!val) { return false; } currentFocus = -1; /*create a DIV element that will contain the items (values):*/ a = document.createElement("DIV"); a.setAttribute("id", this.id + "autocomplete-list"); a.setAttribute("class", "autocomplete-items"); /*append the DIV element as a child of the autocomplete container:*/ this.parentNode.appendChild(a); /*for each item in the array...*/ for (i = 0; i < arr.length; i++) { /*check if the item starts with the same letters as the text field value:*/ if (arr[i].toUpperCase().indexOf(val.toUpperCase()) > -1) { /*create a DIV element for each matching element:*/ b = document.createElement("DIV"); /*make the matching letters bold:*/ let index = arr[i].toUpperCase().indexOf(val.toUpperCase()); b.innerHTML = arr[i].substr(0, index); b.innerHTML += "<strong>" + arr[i].substr(index, val.length) + "</strong>"; b.innerHTML += arr[i].substr(index + val.length); /*insert a input field that will hold the current array item's value:*/ b.innerHTML += "<input type='hidden' value='" + arr[i] + "'>"; /*execute a function when someone clicks on the item value (DIV element):*/ b.addEventListener("click", function(e) { /*insert the value for the autocomplete text field:*/ inp.value = this.getElementsByTagName("input")[0].value; /*close the list of autocompleted values, (or any other open lists of autocompleted values:*/ closeAllLists(); }); a.appendChild(b); } } }); /*execute a function presses a key on the keyboard:*/ inp.addEventListener("keydown", function(e) { var x = document.getElementById(this.id + "autocomplete-list"); if (x) x = x.getElementsByTagName("div"); if (e.keyCode == 40) { /*If the arrow DOWN key is pressed, increase the currentFocus variable:*/ currentFocus++; /*and and make the current item more visible:*/ addActive(x); } else if (e.keyCode == 38) { //up /*If the arrow UP key is pressed, decrease the currentFocus variable:*/ currentFocus--; /*and and make the current item more visible:*/ addActive(x); } else if (e.keyCode == 13) { /*If the ENTER key is pressed, prevent the form from being submitted,*/ e.preventDefault(); if (currentFocus > -1) { /*and simulate a click on the "active" item:*/ if (x) x[currentFocus].click(); } } }); inp.addEventListener("focus", function(e) { if (!this.value) { showAllOptions(this, fruitlist); } }); inp.addEventListener("blur", function(e) { let valid = false; for (let i = 0; i < fruitlist.length; i++) { if (fruitlist[i] === this.value) { valid = true; break; } } if (!valid) { this.value = ""; // Clear the input if it's invalid alert("Please select a valid fruit from the list."); } }); function addActive(x) { /*a function to classify an item as "active":*/ if (!x) return false; /*start by removing the "active" class on all items:*/ removeActive(x); if (currentFocus >= x.length) currentFocus = 0; if (currentFocus < 0) currentFocus = (x.length - 1); /*add class "autocomplete-active":*/ x[currentFocus].classList.add("autocomplete-active"); } function removeActive(x) { /*a function to remove the "active" class from all autocomplete items:*/ for (var i = 0; i < x.length; i++) { x[i].classList.remove("autocomplete-active"); } } function closeAllLists(elmnt) { /*close all autocomplete lists in the document, except the one passed as an argument:*/ var x = document.getElementsByClassName("autocomplete-items"); for (var i = 0; i < x.length; i++) { if (elmnt != x[i] && elmnt != inp) { x[i].parentNode.removeChild(x[i]); } } } function showAllOptions(inp, arr) { var a, b, i, val = ""; // val设为空，显示所有项 closeAllLists(); currentFocus = -1; a = document.createElement("DIV"); a.setAttribute("id", inp.id + "autocomplete-list"); a.setAttribute("class", "autocomplete-items"); inp.parentNode.appendChild(a); for (i = 0; i < arr.length; i++) { b = document.createElement("DIV"); b.innerHTML = arr[i]; b.innerHTML += "<input type='hidden' value='" + arr[i] + "'>"; b.addEventListener("click", function(e) { inp.value = this.getElementsByTagName("input")[0].value; closeAllLists(); }); a.appendChild(b); } } /*execute a function when someone clicks in the document:*/ document.addEventListener("click", function(e) { closeAllLists(e.target); }); } /*An array containing all the country names in the world:*/ var fruitlist = [ "Apple", "Mango", "Pear", "Banana", "Berry" ]; /*initiate the autocomplete function on the "myFruitList" element, and pass along the fruit array as possible autocomplete values:*/ fruitautocomplete(document.getElementById("myFruitList"), fruitlist); </script> </body> </html>注意事项 性能: 对于大型数据集，模糊匹配可能会影响性能。
在C++中，argc 和 argv 是传递给 main 函数的两个参数，用于接收命令行输入的数据。
这个表达式的结果是一个函数，其签名变为 func(*x, int)。
理解HTTP会话与浏览器关闭的挑战 HTTP协议是无状态的，这意味着服务器不会主动记住客户端之前的请求。
由于int类型范围限制，n过大（如超过12）会导致溢出。
这个group值是该子数组中所有键值对在重构后都将共享的属性。
1. typeid可获取对象动态类型，需作用于多态类型的解引用指针以获得实际类型；2. dynamic_cast用于安全向下转型，转换失败返回nullptr或抛异常；3. 可结合两者先判断再转换；4. 注意RTTI依赖虚函数且可能被编译器关闭，typeid.name()结果与编译器相关。
pets[0] = dog: NewDog() 返回一个 *Dog 类型的指针，由于 Dog 实现了 Animal 接口，Go 语言会自动将 *Dog 类型的值转换为 Animal 接口类型的值，并存储在切片中。
当后续请求到达view2时，Gunicorn可能将其路由到另一个不同的worker进程。
Golang标准库encoding/xml可以直接解析这类结构化数据。
使用 nlohmann/json 库后，C++ 解析 JSON 就变得像脚本语言一样直观。
GOPATH：工作区路径，存放项目源码（src）、编译后文件（pkg）和可执行文件（bin）。
首先，使用sqlsrv扩展时，通过LoginTimeout和ConnectionTimeout设置连接超时（如5秒），防止连接阻塞；其次，通过QueryTimeout设置查询执行超时（如10秒），避免慢查询影响服务。
立即学习“PHP免费学习笔记（深入）”； 示例： for ($i = 0; $i < count($items); $i++) { echo "处理第 {$i} 项\n"; } 这里使用 $i++ 是标准做法，因为判断条件使用的是当前 $i 值，递增发生在本轮循环结束后。
教程强调，尽管os.access可作预检，但实际写入操作应优先采用try-except块，以确保操作的健壮性和准确性。
\n"; } else { echo "属性 '{$anotherTargetValue}' 不存在于数组中。
0 查看详情 完整示例 以下是完整的代码示例，包括路由定义和控制器： routes/web.php:<?php use Illuminate\Support\Facades\Route; use App\Http\Controllers\InvitationController; Route::get('/discount', function(){ return 'some_discount_code_here'; })->name('discountCode')->middleware('signed'); Route::get('/generate-signature', [InvitationController::class, 'discount']);app/Http/Controllers/InvitationController.php:<?php namespace App\Http\Controllers; use Illuminate\Http\Request; use Illuminate\Support\Facades\URL; class InvitationController extends Controller { public function discount(){ return URL::signedRoute('discountCode'); } }注意事项 确保 Kernel.php 文件中的 $routeMiddleware 数组包含 'signed' => \Illuminate\Routing\Middleware\ValidateSignature::class,，以便启用签名验证中间件。
textStatus：一个字符串，描述了请求的状态（例如 "success"）。
2. 在 PhpStorm 中配置 PHP 解释器 打开项目后，进入设置页面绑定 PHP 可执行文件。
它会执行单独的查询来获取关联数据，并将这些数据作为模型实例的属性附加到主模型上，而不是将关联字段直接并入主查询的结果集。
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