超级简单的图片压缩方法（原生js）

data为图片的base64数据
quality  为压缩的质量 0 - 1
//图片压缩
function PictureCompression(data,quality) {return new Promise((resolve,reject) =>{let imga = document.createElement('img');imga.src = data;imga.style.width = '300px';imga.style.position = 'fixed';imga.style.top = '300px';imga.style.top = '-4000px';document.body.appendChild(imga);imga.onload = () => {let canvas = document.createElement('canvas');canvas.style.position = 'fixed';canvas.style.top = '-4000px';canvas.width = imga.width;canvas.height = imga.height;document.body.appendChild(canvas);var ctx = canvas.getContext('2d');ctx.drawImage(imga,0,0,canvas.width,canvas.height);var base64Img = canvas.toDataURL('image/jpeg',quality);document.body.removeChild(canvas);document.body.removeChild(imga);resolve(base64Img);}})
}

使用

PictureCompression(‘XXXXXXXX’,0.7).then(res =>{res  压缩后的base64
})

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