如果你使用jQuery的,那麼你可以使用$.ajaxfunction
發送一個AJAX請求。請確保您處理結果done()
function
中的響應,因爲success
已棄用。
平原AJAX請求例如:
HTML:
<!DOCTYPE html>
<html>
<body>
<div id="demo"><h2>Let AJAX change this text</h2></div>
<button type="button" onclick="loadDoc()">Change Content</button>
</body>
</html>
JS:
function loadDoc() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("demo").innerHTML = this.responseText;
}
};
xhttp.open("GET", "ajax_info.txt", true);
xhttp.send();
}
從here兩者。如果您掌握了AJAX請求,那麼下一步就是使用setInterval編寫一個輪詢器。第一個參數應該是發送請求的function
,第二個參數應該是兩次執行之間的毫秒數(在這種情況下爲10000)之間的時間。或者你可以使用現有的輪詢器。這是我實施的一個:
function Initializable(params) {
this.initialize = function(key, def, private) {
if (def !== undefined) {
(!!private ? params : this)[key] = (params[key] !== undefined) ? params[key] : def;
}
};
}
function Poller(params) {
Initializable.call(this, params);
var that = this;
this.initialize("url", window.location.href);
this.initialize("interval", 5000);
this.initialize("type", "POST");
this.initialize("method", "POST");
this.initialize("data", {});
this.initialize("strict", true);
var defaultFunction = function() {};
this.initialize("done", defaultFunction);
this.initialize("fail", defaultFunction);
this.initialize("always", defaultFunction);
this.isRunning = function() {
return !!params.intervalID;
};
this.run = function() {
if (this.strict && (this.green === false)) {
return;
}
this.green = false;
$.ajax({
url: this.url,
method: this.method,
data: this.data
}).done(function(data, textStatus, jqXHR) {
that.green = true;
that.done(data, textStatus, jqXHR);
}).fail(function(jqXHR, textStatus, errorThrown) {
that.green = true;
that.fail(jqXHR, textStatus, errorThrown);
}).always(function(param1, param2, param3) {
that.green = true;
that.always(param1, param2, param3);
});
};
this.start = function() {
if (!params.intervalID) {
this.run();
params.intervalID = setInterval(this.run.bind(this), this.interval);
}
};
this.stop = function() {
if (!!params.intervalID) {
clearInterval(params.intervalID);
params.intervalID = undefined;
}
};
}
我可以請求downvoter告訴我他爲什麼downvote我的答案? –