图片加载失败后CSS样式处理最佳实践

[xianzou]

图片加载异常同时显示alt文字说明和默认图片加载异常背景

图片默认最小高度和宽度为48px 请务必自行根据项目设置图片高宽

使用：

import Img from './components/Img';
const Demo = () => {
    return (
    	<Img alt="图片描述，文字加载失败显示文字" src="图片路径" className="图片类名" ...{otherProps} />
    )
}

组件代码：

import '../styles/img.css';
import React from 'react';

export const Img = ({ src,alt,errorImg,...props }) => {
    return (
        <img 
            src={src} 
            alt={alt} 
            loading="lazy" 
            onError={
                e =>{
                    e.target.onerror = null;
                    if(errorImg){
                        e.target.src = errorImg; 
                    }else{
                        e.target.classList.add('x-img-error')
                    }
                }
            } 
            {...props} 
        />
    )
}

样式

img.x-img-error {
    display: inline-block;
    transform: scale(1);
    content: '';
    color: transparent;
    min-width: 48px;
    min-height: 48px;
  }
img.x-img-error::before {
    content: '';
    position: absolute;
    left: 0; top: 0;
    width: 100%; height: 100%;
    background: #f5f5f5 url("data:image/svg+xml,%3Csvg class='icon' viewBox='0 0 1024 1024' xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cpath d='M304.128 456.192c48.64 0 88.064-39.424 88.064-88.064s-39.424-88.064-88.064-88.064-88.064 39.424-88.064 88.064 39.424 88.064 88.064 88.064zm0-116.224c15.36 0 28.16 12.288 28.16 28.16s-12.288 28.16-28.16 28.16-28.16-12.288-28.16-28.16 12.288-28.16 28.16-28.16z' fill='%23e6e6e6'/%3E%3Cpath d='M887.296 159.744H136.704C96.768 159.744 64 192 64 232.448v559.104c0 39.936 32.256 72.704 72.704 72.704h198.144L500.224 688.64l-36.352-222.72 162.304-130.56-61.44 143.872 92.672 214.016-105.472 171.008h335.36C927.232 864.256 960 832 960 791.552V232.448c0-39.936-32.256-72.704-72.704-72.704zm-138.752 71.68v.512H857.6c16.384 0 30.208 13.312 30.208 30.208v399.872L673.28 408.064l75.264-176.64zM304.64 792.064H165.888c-16.384 0-30.208-13.312-30.208-30.208v-9.728l138.752-164.352 104.96 124.416-74.752 79.872zm81.92-355.84l37.376 228.864-.512.512-142.848-169.984c-3.072-3.584-9.216-3.584-12.288 0L135.68 652.8V262.144c0-16.384 13.312-30.208 30.208-30.208h474.624L386.56 436.224zm501.248 325.632c0 16.896-13.312 30.208-29.696 30.208H680.96l57.344-93.184-87.552-202.24 7.168-7.68 229.888 272.896z' fill='%23e6e6e6'/%3E%3C/svg%3E") no-repeat center / 50% 50%;
  }
img.x-img-error::after {
    content: attr(alt);
    position: absolute;
    left: 0; bottom: 0;
    width: 100%;
    line-height: 2;
    background-color: rgba(0,0,0,.5);
    color: white;
    font-size: 12px;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }