上传图片 js 不确定不多图片

 <input id="sfz_shouchi" name="sfz_shouchi" type="file" onchange="preImg(this.id,'sfz_shouchi_img');" accept="image/*" required="">

<script language="javascript">
    function getFileUrl(sourceId) {
        var url;
        if (navigator.userAgent.indexOf("MSIE") >= 1) { // IE
            url = document.getElementById(sourceId).value;
        } else if (navigator.userAgent.indexOf("Firefox") > 0) { // Firefox
            url = window.URL.createObjectURL(document.getElementById(sourceId).files.item(0));
        } else if (navigator.userAgent.indexOf("Chrome") > 0) { // Chrome
            url = window.URL.createObjectURL(document.getElementById(sourceId).files.item(0));
        }
        return url;
    }

    function preImg(sourceId, targetId) {
        var url = getFileUrl(sourceId);
        var imgPre = document.getElementById(targetId);
        imgPre.src = url;
    }
</script>