document.getElementById('text1'). 话语解析！

document.getElementById('text1').**** 语句解析！！！
需要前后文代码吗？

JScript code

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 var xmlhttp;
    function hello(){
       xmlhttp=ajax1();
        var a=document.getElementById('a').value;
        var b=document.getElementById('b').value;
        var url='demo02.php?a='+a+'&b='+b;

        xmlhttp.open('get',url);
        xmlhttp.onreadystatechange=display;
        xmlhttp.send();}
    function display()
    {
        if(xmlhttp.readyState==4 && xmlhttp.status==200)

            document.getElementById('text1').value=xmlhttp.responseText;
    }

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HTML code

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A<input type="text" id='a'><br>
B<input type="text" id='b'><br>
和是：<div  id='text1'></div>
<input type="button" value="点击" onclick='hello()'>

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