Javascript每300秒運行一次腳本

Question

我有以下代碼在我的頁面上顯示一個php文件。但我希望有人能幫助我，這樣的代碼刷新每300秒

httpRequest("recent-widget.php", showrecent); 
function showrecent(WIDGET){ 
d = document.getElementById('recent-widget'); 
d.innerHTML = WIDGET; 
} 

function httpRequest(url, callback) { 
    var httpObj = false; 
    if (typeof XMLHttpRequest != 'undefined') { 
    httpObj = new XMLHttpRequest(); 
    } else if (window.ActiveXObject) { 
    try{ 
     httpObj = new ActiveXObject('Msxml2.XMLHTTP'); 
    } catch(e) { 
     try{ 
     httpObj = new ActiveXObject('iMicrosoft.XMLHTTP'); 
     } catch(e) {} 
    } 
    } 
    if (!httpObj) return; 
    httpObj.onreadystatechange = function() { 
    if (httpObj.readyState == 4) { // when request is complete 
     callback(httpObj.responseText); 
    } 
    }; 
    httpObj.open('GET', url, true); 
    httpObj.send(null); 
} 

Answer 1

只需使用setInterval重複你的前撥打電話每300000毫秒。例如

setInterval(function() { 
    httpRequest("recent-widget.php", showrecent); 
}, 300000); 

Answer 2

你可以這樣做：

setInterval(function() { 
    httpRequest("recent-widget.php", showrecent) 
} , 300000);