将XMLHttpRequest.responseText存储为变量:( [英] store XMLHttpRequest.responseText as variable :(

问题描述

<script language="javascript" type="text/javascript">

try{
    // Opera 8.0+, Firefox, Safari
    ajaxRequest = new XMLHttpRequest();
} catch (e){
    // Internet Explorer Browsers
    try{
        ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
        try{
            ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (e){
            // Something went wrong
            alert("Your browser broke!");
            return false;
        }
    }
}
// Create a function that will receive data sent from the server
ajaxRequest.onreadystatechange = function(){
    if(ajaxRequest.readyState == 4){
var result = ajaxRequest.responseText;      
    }
}
ajaxRequest.open("GET", "vartest.php", true);
document.getElementById('span').innerHTML = result;
ajaxRequest.send(null);

}

推荐答案

这是因为Ajax是异步的，并且在执行此操作时尚未设置result(无论如何，var使其在该函数中是局部的) ，则必须将其删除).

This is because Ajax is asynchronous, and result isn't set yet when you do this (plus the var makes it local to the function anyway, you'd have to remove that).

最好的办法是将innerHTML行移到readystatechange回调中.

The best thing to do would be to move the innerHTML line into the readystatechange callback.

ajaxRequest.onreadystatechange = function(){
if(ajaxRequest.readyState == 4){
   document.getElementById('span').innerHTML = ajaxRequest.responseText;;      
}

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