Created
August 7, 2015 11:05
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Ajax - Asynchronous request
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| // file: scripts/addLoadEvent.js | |
| function addLoadEvent(func){ | |
| var oldonload = window.onload; | |
| if(typeof window.onload != "function"){ | |
| window.onload = func; | |
| }else { | |
| window.onload = function(){ | |
| oldonload(); | |
| func(); | |
| } | |
| } | |
| } |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Ajax</title> | |
| </head> | |
| <body> | |
| <div id="new" ><p>why?</p> </div> | |
| <script src="scripts/addLoadEvent.js"></script> | |
| <script src="scripts/getHttpObject.js"></script> | |
| <script src="scripts/getNewContent.js"></script> | |
| </body> | |
| </html> |
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| // file: scripts/getHttpObject.js | |
| function getHttpObject() { | |
| if (typeof XMLHttpRequest == "undefined"){ | |
| XMLHttpRequest = function(){ | |
| try{ | |
| return new ActiveXObject("Msxml2.XMLHTTP6.0"); | |
| }catch(e){ | |
| } | |
| try{ | |
| return new ActiveXObject("Msxml2.XMLHTTP3.0"); | |
| }catch(e){ | |
| } | |
| try{ | |
| return new ActiveXObject("Msxml2.XMLHTTP"); | |
| }catch(e){ | |
| } | |
| return false; | |
| } | |
| }else{ | |
| return new XMLHttpRequest(); | |
| } | |
| } |
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| // file: scripts/getNewContent.js | |
| // window.onload = getNewContent; | |
| addLoadEvent(getNewContent); | |
| function getNewContent(){ | |
| var request = getHttpObject(); | |
| // var request = new XMLHttpRequest(); | |
| if(request){ | |
| request.open("GET","example.txt",true); | |
| request.onreadystatechange = function(){ | |
| if(request.readyState == 4){ | |
| // 测试异步 | |
| alert("Response Received"); | |
| var para = document.createElement("p"); | |
| var txt = document.createTextNode(request.responseText); | |
| para.appendChild(txt); | |
| document.getElementById("new").appendChild(para); | |
| } | |
| } | |
| request.send(null); | |
| } else { | |
| alert("Sorry, your browser doesn\'t support XMLHttpRequest"); | |
| } | |
| // 测试异步 | |
| alert("Function Done."); | |
| } |
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