canvas转存为图片实例教程

<canvas id="canvas"></canvas><button class="button-balanced" id="save">save</button><br /><a href="" download="canvas_love.png" id="save_href">    <img  src="" id="save_img"/ alt="canvas转存为图片实例教程" ></a>

var c=document.getElementById("canvas");function drawLove(canvas){    let ctx = canvas.getContext("2d");    ctx.beginPath();    ctx.fillStyle="#E992B9";    ctx.moveTo(75,40);    ctx.bezierCurveTo(75,37,70,25,50,25);    ctx.bezierCurveTo(20,25,20,62.5,20,62.5);    ctx.bezierCurveTo(20,80,40,102,75,120);    ctx.bezierCurveTo(110,102,130,80,130,62.5);    ctx.bezierCurveTo(130,62.5,130,25,100,25);    ctx.bezierCurveTo(85,25,75,37,75,40);    ctx.fill();}drawLove(c); var butSave = document.getElementById("save");butSave.onclick=function(){    var svaeHref = document.getElementById("save_href");    /*     * 传入对应想要保存的图片格式的mime类型     * 常见：image/png，image/gif,image/jpg,image/jpeg     */    var img = document.getElementById("save_img");    var tempSrc = canvas.toDataURL("image/png");    svaeHref.href=tempSrc;     img.src=tempSrc;  };