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                            1. 創建ajax對象

主流瀏覽器var xhr=new XMLHttpRequest();

IE(6/7/8)方式:

var xhr = new ActiveXObject(“Microsoft.XMLHTTP”); //最原始方式

var xhr = new ActiveXObject(“Msxml2.XMLHTTP”); //升級

var xhr = new ActiveXObject(“Msxml2.XMLHTTP.3.0”); //升級

var xhr = new ActiveXObject(“Msxml2.XMLHTTP.5.0”); //升級

var xhr = new ActiveXObject(“Msxml2.XMLHTTP.6.0”); //IE維護的最高版本

考慮瀏覽器兼容

![Image](https://box.kancloud.cn/97e64f1558e9fe3b5cc51b0f7289d46e_350x190.png)

1. 創建一個新的http請求協議,并設置請求的服務器端地址,

對象.open(請求方式get/post,url服務器端地址);

xhr.open(‘get’,’./02.php’);  //這里xhr就是上面ajax對象,后面就是處理文件

1. 把http請求發送給服務器

對象.send(get-null/post請求數據);

xhr.send(null);  //這是get這樣寫,post見后面


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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