标签搜索
搜索到
24
篇与
的结果
-
如何理解 JS 的异步？ 参考:JS是一门单线程的语言，这是因为它运行在浏览器的渲染主线程中，而渲染主线程只有一个。而渲染主线程承担着诸多的工作，渲染页面、执行 JS 都在其中运行。如果使用同步的方式，就极有可能导致主线程产生阻塞，从而导致消息队列中的很多其他任务无法得到执行。这样一来，一方面会导致繁忙的主线程白白的消耗时间，另一方面导致页面无法及时更新，给用户造成卡死现象。所以浏览器采用异步的方式来避免。具体做法是当某些任务发生时，比如计时器、网络、事件监听，主线程将任务交给其他线程去处理，自身立即结束任务的执行，转而执行后续代码。当其他线程完成时，将事先传递的回调函数包装成任务，加入到消息队列的末尾排队，等待主线程调度执行。在这种异步模式下，浏览器永不阻塞，从而最大限度的保证了单线程的流畅运行。 -
-
-
防抖与节流 防抖与节流的区别：虽然防抖和节流都是优化高频率事件的方法，但它们有不同的侧重点：防抖（Debouncing）：在特定时间内只执行一次函数，时间段内的重复调用会重新计时。适用于搜索输入、窗口调整大小等事件。节流（Throttling）：限制函数在特定时间内执行的次数。适用于滚动事件、鼠标移动等。<script> function debounce(func, wait) { let timeout; return function (...args) { const context = this; clearTimeout(timeout); timeout = setTimeout(() => { func.apply(context, args); }, wait); }; } // 定义需要防抖的函数 function handleResize() { console.log('Window resized'); } // 创建防抖函数，设置等待时间为 300 毫秒 const debouncedResize = debounce(handleResize, 300); // 添加事件监听器 window.addEventListener('resize', debouncedResize); // 定义需要防抖的函数 function handleInput(event) { console.log('Input value:', event.target.value); } // 创建防抖函数，设置等待时间为 500 毫秒 const debouncedInput = debounce(handleInput, 500); // 添加事件监听器 // const inputElement = document.querySelector('input'); // inputElement.addEventListener('input', debouncedInput); // 节流函数实现 function throttle(func, wait) { let timeout; let lastRun = 0; return function (...args) { const context = this; const now = Date.now(); if (now - lastRun >= wait) { lastRun = now; func.apply(context, args); } else { clearTimeout(timeout); timeout = setTimeout(() => { lastRun = Date.now(); func.apply(context, args); }, wait - (now - lastRun)); } }; } // 节流函数使用示例 // 定义需要节流的函数 function handleScroll() { console.log('Scrolled'); } // 创建节流函数，设置等待时间为 200 毫秒 const throttledScroll = throttle(handleScroll, 200); // 添加事件监听器 window.addEventListener('scroll', throttledScroll); </script>
-
jquery 点击锚点事件并取消scroll事件，平滑滚动至锚点位置 在jQuery中，如果你想要取消由锚点点击触发的滚动事件，你可以使用event.preventDefault()方法来阻止默认的滚动行为。以下是一个简单的例子：$(document).ready(function(){ $('a[href*="#"]').click(function(event){ // 阻止默认的点击事件 event.preventDefault(); // 获取目标位置 var target = $(this.hash); target = target.length ? target : $('[name=' + this.hash.slice(1) +']'); // 执行平滑滚动 if (target.length) { $('html, body').animate({ scrollTop: target.offset().top }, 1000); } }); });
-
-
javascript 复制粘贴 <script> function sun_copy() { var coupon_code_dom = document.getElementById("coupon-code") var show_copy = document.getElementById("sunshine-copy") var coupon_code = coupon_code_dom.innerText var inp = document.createElement("input") document.body.appendChild(inp) inp.value = coupon_code inp.select() document.execCommand("copy", false) inp.remove() show_copy.innerText = 'Copied' } </script>
-
shopify 增加youtube视频和选项卡 引入相关资源<link rel="stylesheet" href="https://unpkg.com/element-ui@2.15.13/lib/theme-chalk/index.css"> <script src="https://cdn.shopify.com/s/files/1/0607/1861/2695/files/vue.min.js"></script> <script src="https://cdn.shopifycdn.net/s/files/1/0136/3119/3188/files/elementui-index.js"></script>sun-tab-video-css style liquid<style> * { margin: 0; padding: 0; box-sizing: border-box; } [v-cloak] { display: none; } @media (min-width: 1200px) { #shopify-section-header-08 .container, #shopify-section-navigation-08 .container { width: 1400px; } } .sun-video { width: 80%; margin: 50px auto; } .sun-video .video-group { display: flex; justify-content: space-between; margin: 10px 0; flex-wrap: wrap; } .sun-video .video-item { width: calc(100% / 3 - 10px); margin-top: 20px; } .sun-video .video-group:after { content: ""; display: block; width: calc(100% / 3 - 10px); height: 0; } .sun-video .video-title { display: -webkit-box; font-size: 20px; font-weight: bold; margin: 30px 0; text-align: center; min-height: 50px; overflow: hidden; text-overflow: ellipsis; -webkit-line-clamp: 2; line-clamp: 2; -webkit-box-orient: vertical; } .sun-video .video-content { width: 100%; text-align: center; } .sun-video .video-content:hover .play-button { background: #f00; } .sun-video .youtube { background-color: #000; margin-bottom: 30px; position: relative; padding-top: 56.25%; overflow: hidden; cursor: pointer; } .sun-video .youtube img { width: 100%; top: 0; left: 0; opacity: 0.8; } .sun-video .youtube img[data-class='default'] { top: -40px; } .sun-video .youtube .play-button { width: 90px; height: 60px; background-color: #000; box-shadow: 0 0 30px rgba(0, 0, 0, 0.6); z-index: 1; opacity: 0.8; border-radius: 6px; } .sun-video .youtube .play-button:before { display:block; content: ""; border-style: solid; border-width: 15px 0 15px 26.0px; border-color: transparent transparent transparent #fff; } .sun-video .youtube img, .sun-video .youtube .play-button { cursor: pointer; } .sun-video .youtube img, .sun-video .youtube iframe, .sun-video .youtube .play-button, .sun-video .youtube .play-button:before { position: absolute; } .sun-video .youtube .play-button, .sun-video .youtube .play-button:before { top: 50%; left: 50%; transform: translate3d(-50%, -50%, 0); display:block; } .sun-video .youtube iframe { height: 100%; width: 100%; top: 0; left: 0; } .sun-video .main-container-img img { width: 100%; } @media (max-width: 1000px) { .sun-video { width: 95%; } .sun-video .video-item { width: 100%; margin: 10px auto; } } @media (min-width: 1600px) { } </style> <style> .el-tabs__nav { width: 100%; } .el-tabs__item { padding: 0; width: calc(100% / {{ section.settings.tab_count | default: 2 }}); text-align: center; /*border-left: 1px solid #ccc;*/ /*border-top: 1px solid #ccc;*/ /*border-right: 1px solid #ccc;*/ /*border-bottom: 0;*/ } .el-tabs__item.is-active { color: #e71c20; } .el-tabs__active-bar { background-color: #e71c20; /*bottom: auto;*/ } .el-tabs__item:hover { color: #e71c20; } .el-tabs--card > .el-tabs__header .el-tabs__item.is-active { border-top: 2px solid #e71c20; } </style> <div class="sun-video" id="sun-video-app" v-cloak> <el-tabs id="sun-video-tab-content" v-model="activeName" @tab-click="handleClick" type="card"> </el-tabs> </div>html section {% if customer.id or true %} {% if section.settings.render_first %} {% render 'sun-tab-video-css' %} {% endif %} {% if section.settings.tab_title == blank %} <style> .el-tabs--card>.el-tabs__header{display:none;} </style> {% endif %} <div id="{{ section.id }}" style="display:none;"> {% if section.settings.tab_title %} <el-tab-pane label="{{ section.settings.tab_title }}" name="{% if section.settings.render_first %}first{% else %} {{ section.id }}{% endif %}"> {% endif %} <div class="video-group"> {% for block in section.blocks %} <div class="video-item"> <p class="video-title">{{ block.settings.title }}</p> <div class="video-content"> <div class="youtube" data-embed="{{ block.settings.embed_id }}" data-max="{{ block.settings.max }}"> <div class="play-button"></div> </div> </div> </div> {% endfor %} </div> {% if section.settings.tab_title %} </el-tab-pane> {% endif %} </div> <script> window.sunshine.tab_html = $('#{{ section.id }}').html(); $("#sun-video-tab-content").append(window.sunshine.tab_html) </script> {% if section.settings.render_last %} {% render 'sun-tab-video-js' %} {% endif %} {% endif %} {% schema %} { "name": "Sun Tab Video", "settings": [ { "type":"checkbox", "label":"Render First", "id":"render_first", "default": false }, { "type":"checkbox", "label":"Render Last", "id":"render_last", "default": false }, { "type":"number", "label":"Tab Count", "id":"tab_count" }, { "type":"text", "label":"Tab Title", "id":"tab_title" } ], "blocks":[ { "type":"text", "name":"Tab Item", "settings": [ { "type":"text", "id":"title", "label":"Item Title" }, { "type":"text", "id":"embed_id", "label":"Youtube Embed Id" }, { "type":"checkbox", "id":"max", "label":"Thumb Image Max?", "default":true } ] } ], "presets":[ { "name":"Sun Tab Video" } ] } {% endschema %}sun-tab-video-js <script> new Vue({ el: "#sun-video-app", delimiters: ['${', '}'], data: function () { return { activeName: 'first' } }, methods: { handleChange(val) { // console.log(val); }, handleClick(tab, event) { // console.log(tab, event); }, btn_submit() { // console.log('submit') } }, created() { }, computed: {} }) </script> <script> var youtube = document.querySelectorAll(".youtube"); // loop for (var i = 0; i < youtube.length; i++) { var source = ''; var img_class = ''; // thumbnail image source. if (youtube[i].dataset.max == 'true') { source = "https://img.youtube.com/vi/" + youtube[i].dataset.embed + "/maxresdefault.jpg"; img_class = 'max'; } else { source = "https://img.youtube.com/vi/" + youtube[i].dataset.embed + "/0.jpg"; img_class = 'default'; } var image = new Image(); image.src = source; image.setAttribute('data-class', img_class); image.addEventListener("load", function () { youtube[i].appendChild(image); }(i)); youtube[i].addEventListener("click", function () { var iframe = document.createElement("iframe"); iframe.setAttribute("frameborder", "0"); iframe.setAttribute("allowfullscreen", ""); iframe.setAttribute("src", "https://www.youtube.com/embed/" + this.dataset.embed + "?rel=0&autoplay=1&showinfo=1"); this.innerHTML = ""; this.appendChild(iframe); }); } </script>
-
-
Shopify delivery date Shopify delivery date<div class="sun-delivery"></div> <script> $(function () { const minDays = parseInt({{ block.settings.min_date | default: 0}}); const maxDays = parseInt({{ block.settings.max_date | default: 0 }}); const customText = '{{block.settings.custom_content}}'; const minDate = new Date(Date.now() + (minDays * 86400000)); const maxDate = new Date(Date.now() + (maxDays * 86400000)); const formatDate = (minDate.getFullYear() == maxDate.getFullYear() && minDate.getFullYear() == new Date().getFullYear()) ? new Intl.DateTimeFormat('en', {month: 'short', day: '2-digit'}) : new Intl.DateTimeFormat('en', {month: 'short', day: '2-digit', year: 'numeric'}); const tipText = customText.replace(/\{min_date\}/g, '<b>' + formatDate.format(minDate) + '</b>') .replace(/\{max_date\}/g, '<b>' + formatDate.format(maxDate) + '</b>'); $('.sun-delivery').html(tipText) }) </script>
