深圳住房城乡建设局网站首页优化网站建设

说明：我计划用angular实现一个轮播图的效果，必须设置图片切换动画，图片自动轮播，设置轮播的间隔时间，然后还有两个按钮 收到控制图片的上一页，下一页的切换
效果图：

step1: C:\Users\Administrator\WebstormProjects\untitled4\src\app\banner\banner.component.ts

import { Component , Input, OnInit, OnDestroy, OnChanges, SimpleChanges} from '@angular/core';
import { trigger, transition, style, animate, state } from '@angular/animations';
import {NgForOf, NgIf} from '@angular/common';@Component({selector: 'app-banner',imports: [NgForOf,NgIf],templateUrl: './banner.component.html',styleUrl: './banner.component.css',animations: [trigger('slide', [state('void', style({ opacity: 0 })),transition('void => *', [style({ transform: 'translateX(100%)', opacity: 0 }),animate('600ms cubic-bezier(0.25, 0.8, 0.25, 1)',style({ transform: 'translateX(0)', opacity: 1 }))]),transition('* => void', [animate('600ms cubic-bezier(0.25, 0.8, 0.25, 1)',style({ transform: 'translateX(-100%)', opacity: 0 }))])])]
})
export class BannerComponent implements OnInit, OnDestroy, OnChanges  {@Input() images: string[] = [];currentIndex = 0;autoPlayInterval: any;isDragging = false;startX = 0;threshold = 50;defaultImages = ['https://randomuser.me/api/portraits/men/1.jpg','https://randomuser.me/api/portraits/men/2.jpg','https://randomuser.me/api/portraits/men/3.jpg','https://randomuser.me/api/portraits/men/4.jpg','https://randomuser.me/api/portraits/men/5.jpg','https://randomuser.me/api/portraits/men/6.jpg'];ngOnInit() {this.initImages();this.startAutoPlay();}ngOnChanges(changes: SimpleChanges) {if (changes['images']) {this.initImages();}}private initImages() {if (this.images.length === 0) {this.images = [...this.defaultImages];}}ngOnDestroy() {clearInterval(this.autoPlayInterval);}startAutoPlay() {this.autoPlayInterval = setInterval(() => {this.next();}, 3000);}next() {this.currentIndex = (this.currentIndex + 1) % this.images.length;}prev() {this.currentIndex = (this.currentIndex - 1 + this.images.length) % this.images.length;}goTo(index: number) {this.currentIndex = index;}pauseAutoPlay() {clearInterval(this.autoPlayInterval);}resumeAutoPlay() {this.startAutoPlay();}onTouchStart(e: TouchEvent) {this.startX = e.touches[0].clientX;this.isDragging = true;this.pauseAutoPlay();}onTouchMove(e: TouchEvent) {if (!this.isDragging) return;const currentX = e.touches[0].clientX;const diff = this.startX - currentX;if (Math.abs(diff) > this.threshold) {diff > 0 ? this.next() : this.prev();this.isDragging = false;}}onTouchEnd() {this.isDragging = false;this.resumeAutoPlay();}}

step2: C:\Users\Administrator\WebstormProjects\untitled4\src\app\banner\banner.component.html

<!-- banner.component.html -->
<div class="carousel-container"(mouseenter)="pauseAutoPlay()"(mouseleave)="resumeAutoPlay()"(touchstart)="onTouchStart($event)"(touchmove)="onTouchMove($event)"(touchend)="onTouchEnd()"><div class="slide-wrapper"><ng-container *ngFor="let img of images; let i = index"><div class="slide" @slide *ngIf="currentIndex === i"> <!-- 分离条件判断 --><img [src]="img" alt="Slide {{i + 1}}"></div></ng-container></div><button class="nav-btn prev-btn" (click)="prev()"><svg viewBox="0 0 24 24"><path d="M15.41 16.59L10.83 12l4.58-4.59L14 6l-6 6 6 6 1.41-1.41z"/></svg></button><button class="nav-btn next-btn" (click)="next()"><svg viewBox="0 0 24 24"><path d="M8.59 16.59L13.17 12 8.59 7.41 10 6l6 6-6 6-1.41-1.41z"/></svg></button><div class="indicators"><button *ngFor="let img of images; let i = index"class="indicator"[class.active]="i === currentIndex"(click)="goTo(i)"></button></div>
</div>

step3: C:\Users\Administrator\WebstormProjects\untitled4\src\app\banner\banner.component.css

/* banner.component.css */
.carousel-container {position: relative;width: 100%;max-width: 1200px;margin: 0 auto;border-radius: 20px;overflow: hidden;box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}.slide-wrapper {position: relative;width: 100%;padding-top: 56.25%; /* 16:9 aspect ratio */
}.slide {position: absolute;top: 0;left: 0;width: 100%;height: 100%;
}.slide img {width: 100%;height: 100%;object-fit: cover;
}.nav-btn {position: absolute;top: 50%;transform: translateY(-50%);width: 48px;height: 48px;background: rgba(255, 255, 255, 0.9);border: none;border-radius: 50%;cursor: pointer;display: flex;align-items: center;justify-content: center;box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}.nav-btn:hover {background: white;transform: translateY(-50%) scale(1.1);box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}.nav-btn svg {width: 24px;height: 24px;fill: #2d3748;
}.prev-btn {left: 20px;
}.next-btn {right: 20px;
}.indicators {position: absolute;bottom: 20px;left: 50%;transform: translateX(-50%);display: flex;gap: 8px;
}.indicator {width: 12px;height: 12px;border: none;border-radius: 6px;background: rgba(255, 255, 255, 0.5);cursor: pointer;transition: all 0.3s ease;
}.indicator.active {background: white;width: 24px;
}.indicator:not(.active):hover {background: rgba(255, 255, 255, 0.8);transform: scale(1.2);
}/* 移动端优化 */
@media (max-width: 768px) {.nav-btn {width: 36px;height: 36px;}.nav-btn svg {width: 20px;height: 20px;}.indicators {bottom: 10px;}.indicator {width: 8px;height: 8px;}.indicator.active {width: 16px;}
}

end