Form表单提交下载文件

recordsClick(){//导出表格
    var params = {// 参数
        id：xx,
        name:xx
    };

    var form = document.createElement('form')
    form.id = 'form'
    form.name = 'form'
    document.body.appendChild (form)
    for (var obj in params) {
        if (params.hasOwnProperty(obj)) {
            var input = document.createElement('input')
            input.tpye='hidden'
            input.name = obj;
            input.value = params[obj]
            form.appendChild(input)
        }
    }
    form.method = "GET" //请求方式
    form.action = runEnv.api_url+'请求地址'
    form.submit()
    document.body.removeChild(form)
},