SOURCE

var ctx = canvas.getContext("2d")
var loading = false
function doSubmit() {
    if (loading) return
    loading = true
    const formData = new FormData();
    const fileField = document.querySelector('input[type="file"]');
    if (fileField && fileField.files[0]) {
        formData.append("file", fileField.files[0]);
    }
    fetch('https://ai-image.l904237461.workers.dev/', {
        method: "POST",
        body: formData,
    }).then(r => {
        loading = false
        r.json().then(r => {
            // console.log(r.response1)
            loading = false
            file.value = ''
            img1.src = "data:image/jpeg;base64," + r.inputs.image
            img1.onload = function () {
                canvas.width = img1.width
                canvas.height = img1.height
                ctx.drawImage(img1, 0, 0, img1.width, img1.height)
                ctx.strokeStyle = "#FF0000"
                ctx.lineWidth = 1
                ctx.font = '16px Georgia'
                ctx.fillStyle = 'red'
                for (var i in r.response1) {
                    var v1 = r.response1[i]
                    if (v1.score < 0.8) {
                        //console.log(v1.score)
                        continue
                    }
                    // {"score":0.8240172266960144,"label":"bench","box":{"xmin":0,"ymin":2,"xmax":600,"ymax":359}},
                    ctx.strokeRect(v1.box.xmin + 1, v1.box.ymin + 1, v1.box.xmax - 4 - v1.box.xmin + 1, v1.box.ymax - 4 - v1.box.ymin + 1)
                    ctx.fillText(v1.label, v1.box.xmin + 16, v1.box.ymin + 16)
                    //console.log({x:v1.box.xmin, y:v1.box.ymin, w:v1.box.xmax, h:v1.box.ymax})
                }
            }

        })
    }).catch(() => {
        loading = false
        file.value = ''
    })
}

<div>
	<input type="file" id="file" onchange="doSubmit()"/> 
    <button onclick="doSubmit()">刷新</button>
    <br>
    <canvas id="canvas" style="width: 100%"></canvas>
    <br>
    <img id="img1" style="position: absolute; top: -99999px;z-index: -100;"/>
</div>