js实现文字头像的生成

function gen_text_img(size, s) {
    let colors = [
        "rgb(239,150,26)", 'rgb(255,58,201)', "rgb(111,75,255)", "rgb(36,174,34)", "rgb(80,80,80)"
    ];
    let cvs = document.createElement("canvas");
    cvs.setAttribute('width', size[0]);
    cvs.setAttribute('height', size[1]);
    let ctx = cvs.getContext("2d");
    ctx.fillStyle = colors[Math.floor(Math.random()*(colors.length))];
    ctx.fillRect(0, 0, size[0], size[1]);
    ctx.fillStyle = 'rgb(255,255,255)';
    ctx.font = size[0]*0.6+"px Arial";
    ctx.textBaseline = "middle";
    ctx.textAlign = "center";
    ctx.fillText(s,size[0]/2,size[1]/2);

    return  cvs.toDataURL('image/jpeg', 1);
}