layui上传文件配合进度条

首先看一下效果图：

修改layui的源文件upload.js

1.打开layui/modules/upload.js
2.搜索ajax
3.找到url:
4.添加以下代码：
,xhr:l.xhr(function(e){//此处为新添加功能
         var percent=Math.floor((e.loaded / e.total)*100);//计算百分比
         l.progress(percent);//回调将数值返回
     })

5.upload.js 中 p.prototype.config也要改，加一个xhr的定义，否则传文件时如果不设xhr会报错

p.prototype.config={
    accept:"images",exts:"",auto:!0,bindAction:"",url:""
    ,field:"file",method:"post",data:{},drag:!0,size:0
    ,number:0,multiple:!1
    ,xhr:function(){}//此处需要添加
      },

页面js代码

layui.use(['form', 'layer', "jquery",'element', 'laydate', "upload"], function () {
    var  upload = layui.upload,
        element=layui.element,
        layer = parent.layer === undefined ? layui.layer : top.layer;
    var xhrOnProgress = function (fun) {
        xhrOnProgress.onprogress = fun; //绑定监听
        //使用闭包实现监听绑
        return function () {
            //通过$.ajaxSettings.xhr();获得XMLHttpRequest对象
            var xhr = $.ajaxSettings.xhr();
            //判断监听函数是否为函数
            if (typeof xhrOnProgress.onprogress !== 'function')
                return xhr;
            //如果有监听函数并且xhr对象支持绑定时就把监听函数绑定上去
            if (xhrOnProgress.onprogress && xhr.upload) {
                xhr.upload.onprogress = xhrOnProgress.onprogress;
            }
            return xhr;
        }
    }

    //选择并网时间
    laydate.render({
        elem: '.connectGridTime'
    });

    var enrollArr = [];
    var demoCount=0,demoFlag=false
    var demoClass

    //公司注册信息上传文件
    upload.render({
        elem: '.enroll',
        accept: 'file',
        multiple: true,
        url: sessionStorage.getItem("imgUrl") + "picture-console/common/file/upload",
        xhr: xhrOnProgress,
        progress: function (value) { //上传进度回调 value进度值,由于是进度条同时又是多文件上传不只一个进度条，所以要保证每次进度条的类名不一致，demoCount控制类名，demoFlag保证上下一致，所以该方法一直在被调用
            if(demoFlag){
                console.log(demoCount)
                element.progress(`demo${demoCount}`, value + '%') //设置页面进度条
            }

        },

        before: function (obj) {
            layer.load()
            obj.preview(function (index, file, result) {
                layer.closeAll('loading'); //关闭loading

                demoCount++
                console.log('before',demoCount)
                var size = file.size / 1024 / 1024
                if(size<=1){
                    size=keepTwoDecimal(size*1024)+'KB'
                }else{
                    size=keepTwoDecimal(size)+'MB'
                }
                var tr=`
                    <tr>
                        <td class="fileName">${file.name}</td>
                        <td>${size}</td>
                        <td class="uploadok">
                        <div class="uploadLoadingDiv">
                        <div class="layui-progress bar" lay-showpercent="true" lay-filter="demo${demoCount}">
                            <div class="layui-progress-bar layui-bg-red" lay-percent="0%"><span class="layui-progress-text">100%</span></div>
                        </div>
                    </div>
                        </td>
                        <td><button class="layui-btn layui-btn-danger layui-btn-sm" onclick="registerDel(this)">删除</button></td>
                    </tr>
                `
                $('#enrollBox').append(tr);
                demoFlag=true

            })
        },
        error: function(index, upload){
			element.progress(`demo${demoCount}`, '0%');
			layer.msg('上传失败');
        },
        choose:function(obj){
            demoFlag=false
        },
        done: function (res) {
            if (res.code == '200') {
                enrollArr.push(res.data[0]);
            }
        }
    });
    //四舍五入保留2位小数（若第二位小数为0，则保留一位小数）
function keepTwoDecimal(num) {
    var result = parseFloat(num);

    result = Math.round(num * 100) / 100;
    return result;
  }

});