简单使用的图片上传预览插件作者非常不错！

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>jQuery图片上传前预览</title>
<script src="http://libs.baidu.com/jquery/1.9.1/jquery.min.js"></script>
<style>
</style>
</head>
<body>
<div style="padding: 20px">
    <input onchange="FirstImg()" name="firstImg" style="opacity:0;position:absolute" type="file" id="FirstfileImg" multiple="">
    <div >
        <span> 点击这里上传图片</span>
    </div>
</div>
<fieldset style="width:500px;">
    <legend>图片预览</legend>
    <div style="position: relative;" id="ccc">
    </div>
</fieldset><script>
jQuery.DuoImgsYulan = function(file, id) {
    for (var i = 0; i < 3; i++) {
        if (!/image\/\w+/.test(file[i].type)) {
            alert("请选择图片文件");
            return false;
        }
        if (file[i].size > 2048 * 1024) {
            alert("图片不能大于2MB");
            continue;
        }
        var img;
        console.log(document.getElementById("fileImg"));
        console.log(file[i]);
        console.log("file-size=" + file[i].size);
        var reader = new FileReader();
        reader.onloadstart = function(e) {
            console.log("开始读取....");
        }
        reader.onprogress = function(e) {
            console.log("正在读取中....");
        }
        reader.onabort = function(e) {
            console.log("中断读取....");
        }
        reader.onerror = function(e) {
            console.log("读取异常....");
        }
        reader.onload = function(e) {
            console.log("成功读取....");
            var div = document.createElement("div"); //外层 div
            div.setAttribute("style", "position:relative;width:inherit;height:inherit;float:left;z-index:2;width:150px;margin-left:8px;margin-right:8px;");
            var del = document.createElement("div"); //删除按钮div
            del.setAttribute("style", "position: absolute; bottom: 4px; right: 0px; z-index: 99; width: 30px; height:30px;border-radius:50%;")
            var delicon = document.createElement("img");
            delicon.setAttribute("src", "http://www.jq22.com/tp/f26c324f-24db-4f08-91d6-f7ffc9ca1516.png");
            delicon.setAttribute("title", "删除");
            delicon.setAttribute("style", "cursor:pointer;width: 30px; height:30px");
            del.onclick = function() {
                this.parentNode.parentNode.removeChild(this.parentElement);
                ClearfirtsImg();
            };
            del.appendChild(delicon);
            div.appendChild(del);
            var imgs = document.createElement("img"); //上传的图片
            imgs.setAttribute("name", "loadimgs");
            imgs.setAttribute("src", e.target.result);
            imgs.setAttribute("width", 150);
            if (document.getElementById(id).childNodes.length > 2) {
                document.getElementById(id).removeChild(document.getElementById(id).firstChild);
            }
            div.appendChild(imgs)
            document.getElementById(id).appendChild(div);
        }
        reader.readAsDataURL(file[i]);
    }
}

function FirstImg() {
    $.DuoImgsYulan(document.getElementById("FirstfileImg").files, "ccc");
}

function ClearfirtsImg() {
    var file = $("#FirstfileImg")
    file.after(file.clone().val(""));
    file.remove();
}</script>
</body>
</html>
传送门： https://blog.csdn.net/qq 39198420/article/details/76685745
简单使用的图片上传预览插件 作者非常不错！

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