变量赋值后变成undefined

var jobNameList;

var apiUrl = getApp().globalData.apiUrl; //获取API接口地址

wx.request({

url: apiUrl + ‘api/User/GetJobNameList’,

method: ‘post’,

dataType: ‘json’,

header: {

‘content-type’: ‘application/json’

},

data: {

VerifyToken: verifyToken,

ComeFrom: getApp().globalData.comeFrom,

},

success: function(req) {

// console.log(req.data);

jobNameList = req.data;

},

error: function(req) {

}

})

console.log(jobNameList);

这里输入的时候为什么jobNameList变成了undefined ？