ajax如何初始化,初始化ajax请求的最佳实践

尝试

setTimeout(function () {

var timestamp_last_check = 0; //declare here to make it available to data:

$.ajax({

'method': 'POST',

'url': '/ajax/request_news',

'beforeSend': function () {

alert('Before send')

date = new Date()

timestamp_last_check = Math.floor(date.getTime() / 1000); //set Value here

},

问题强>

var timestamp_last_check仅限于beforeSend:，因此无法在该区域外访问。

'beforeSend': function () {

alert('Before send')

date = new Date()

var timestamp_last_check = Math.floor(date.getTime() / 1000)

},

在OP的评论

之后更新

function doPoll() {

alert('GO POLL');

setTimeout(function () {

var date = new Date();

var timestamp_last_check = Math.floor(date.getTime() / 1000);//set value here

$.ajax({

'method': 'POST',

'url': '/ajax/request_news',

'data': {

'last_check': timestamp_last_check

},

'success': function (ret) {

ret = $.parseJSON(ret)

},

'complete': function () {

doPoll()

}

})

}, 5000)

};