https://github.com/AutomaticLab/imgCompress.js
网上一个开源前端组件
本站配置：
var tiny_jimg={
_png: {width:4096,height:4096,fill:null,format:"image/png",quality:0.9},
_jpg: {width:4096,height:4096,fill:"#FFF",format:"image/jpeg",quality:0.9},
_webp: {width:4096,height:4096,fill:null,format:"image/webp",quality:0.9},
png: {normal:"_webp",nowebp:"_png",animate:false},
jpg: {normal:"_webp",nowebp:"_jpg"},
bmp: {normal:"_webp",nowebp:"_jpg"},
ico: null,
gif: {normal:"_webp",nowebp:"_jpg",animate:false},
webp: {normal:"_webp",nowebp:"_png",animate:false},
};
