$.ajax({
                    type: "POST",
                    url: "/admin/sendsmsyzm",
                    async: true,
                    data:{'tel':tel},
                    success: function (data) {
                        // console.log(data.data)
                        if(data.data){
                            // layer.msg('加载中……', {icon: 1});
                            layer.msg('请修改默认密码后再继续', {icon: 5});
                            result = false;
                        }   
                        else
                        result = true;              
                    },
                })

把整个表单作为POST对象

var form = $('#jnmodal-form')[0];
        var data = new FormData(form);
        console.log(form);
           $.ajax({
                url: url,
                type: 'POST',
                enctype: 'multipart/form-data',
                processData: false, 
                contentType: false,
                cache: false,
                data: data, 
                //dataType: "jsonP",
                success: function(jsonData) {
                    $('#jnmodal').modal('hide');
                    var info = jsonData.data;
                    var code = jsonData.code;
                    if(code==1)
                    {
                        layer.msg(info, {icon: 1});
                    }
                    else
                    {
                        layer.msg(info, {icon: 2});
                    }
                    
                    m.search();
                },
                error : function(XMLHttpRequest, textStatus, errorThrown) {
                            console.log('An Ajax error was thrown.');
                            console.log(XMLHttpRequest);
                            console.log(textStatus);
                            console.log(errorThrown);
                        }
            });