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20230411----重返学习-网易云音乐首页案例-git远程仓库

news 2025/9/14 1:37:06

day-047-forty-seven-20230411-网易云音乐首页案例-git远程仓库

网易云音乐首页案例

事件委托

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8" /><title>2.事件委托</title><style>.parent-box {margin: 50px;display: flex;justify-content: space-around;}.parent-box .child-item {height: 500px;width: 15%;}.child-item.child-color-1 {background-color: skyblue;}.child-item.child-color-2 {background-color: yellow;}.child-item.child-color-3 {background-color: blue;}.child-item.child-color-4 {background-color: red;}.child-item.child-color-5 {background-color: pink;}</style></head><body><div class="parent-box"><div class="child-item child-color-1">01</div><div class="child-item child-color-2">02</div><div class="child-item child-color-3">03</div><div class="child-item child-color-4">04</div><div class="child-item child-color-5">05</div></div></body>
</html>
<script>let parentBox = document.querySelector(".parent-box");parentBox.onclick = function (e) {// console.log(`e.target.classList-->`, e.target.classList);//判断if ((e.target.tagName = "div" && e.target.classList.contains("child-color-1"))) {e.target.classList.remove("child-color-1")e.target.classList.add("child-color-2")console.log(`e.target.innerHTML-->`, e.target.innerHTML);return}if ((e.target.tagName = "div" && e.target.classList.contains("child-color-2"))) {e.target.classList.remove("child-color-2")e.target.classList.add("child-color-3")console.log(`e.target.innerHTML-->`, e.target.innerHTML);return}if ((e.target.tagName = "div" && e.target.classList.contains("child-color-3"))) {e.target.classList.remove("child-color-3")e.target.classList.add("child-color-1")console.log(`e.target.innerHTML-->`, e.target.innerHTML);return}};
</script>

观察者模式

观察者单例

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8" /><title>2.事件委托</title><style>.parent-box {margin: 50px;display: flex;justify-content: space-around;}.parent-box .child-item {height: 60px;width: 15%;}.child-item.child-color-1 {background-color: skyblue;}.child-item.child-color-2 {background-color: yellow;}.child-item.child-color-3 {background-color: blue;}.child-item.child-color-4 {background-color: red;}.child-item.child-color-5 {background-color: pink;}</style></head><body><div class="parent-box"><div class="child-item child-color-1">01</div><div class="child-item child-color-2">02</div><div class="child-item child-color-3">03</div><div class="child-item child-color-4">04</div><div class="child-item child-color-5">删除最新一项</div></div></body>
</html>
<script>const observerObject = {data: [],theLength: 0,add(text) {const theItem = {text,id: this.theLength,time: new Date().getTime(),};this.theLength++;this.data.push(theItem);//可以在这里做一些操作console.log(`添加时：this.data-->`, this.data);return theItem.id;},remove(theId) {let index = this.data.findIndex((item) => item.id === theId);if (index >= 0) {this.data.splice(index, 1);}//可以在这里做一些操作console.log(`删除时：this.data-->`, this.data);},clear() {this.data=[]},};let parentBox = document.querySelector(".parent-box");let nowId = 0;parentBox.onclick = function (e) {if (e.target.classList.contains("child-color-5")) {observerObject.remove(nowId);return;}if (e.target.classList.contains("child-item")) {nowId = observerObject.add(e.target.innerHTML);console.log(`nowId-->`, nowId);return;}};
</script>