//传数组
 $.ajax({
                    type: "POST",
                    url: this.url ,
                    data: {
                        uid: [1,2,3,4]
                    },
                    traditional: true,//这里设置为true
                    success: function (data) {
                    },
                    error: function () {
                    }
                });

//传复杂对象
例子：{
        com_cat: "炊事班",
        onepeople: "onepeople",
        twopeople: 'twopeople',
        datas: [
            {
                sname: "电视机",
                size: "海信T60",
                unit: "台",
                price: 6000,
                expectednum: 2,
                actualnum: 2,
                prices: 6000
            },
            {
                sname: "中性笔",
                size: "齐心",
                unit: "支",
                price: 1.5,
                expectednum: 50,
                actualnum: 50,
                prices: 75
            }
        ]
    }


//前台
$.ajax({
                    type: "POST",
                    url: 
                    data: {
                        com_cat: com_cat,
                        onepeople: onepeople,
                        twopeople: twopeople,
                        datas: JSON.stringify(datas)
                    },
                    traditional: true,//这里设置为true
                    success: function (data) {
                    },
                    error: function () {
                    }
                });
//后台解析
    const com_cat = query.com_cat || ''
    const onepeople = query.onepeople || ''
    const twopeople = query.twopeople || ''
    const datas = JSON.parse(query.datas) || ''