Javascript 总结-优快云博客

本文链接：https://blog.youkuaiyun.com/yangjie1981/article/details/83611709

本文介绍如何创建HttpRequest对象并利用Ajax发送POST请求到指定URL。文章详细展示了如何设置请求头信息，处理服务器返回的数据，并更新页面内容。通过具体示例代码，读者可以了解整个请求过程及响应处理的方法。

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创建HttpRequest对象:
var httpRequest;

function createXMLHttpRequest() {
if(window.XMLHttpRequest)
{
httpRequest = new XMLHttpRequest();
}
else if(window.ActiveXObject)
{
httpRequest = new ActiveXObject("Microsoft.XMLHttp");
}
}

通过ajax发送Action URL：
function seacherdata() {
createXMLHttpRequest();
if (httpRequest) {
var data = document.getElementById("seachervalue");
var selects = document.getElementById("seacherwords");
var keywords = selects.options[selects.options.selectedIndex].value;
var url = "seacherdata.do?text=" + data.value+"&keywords="+keywords;
httpRequest.open("POST",url,true);
httpRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
httpRequest.onreadystatechange = function() {
if(httpRequest.readyState == 4 && httpRequest.status == 200) {
var result = httpRequest.responseText;
document.parentWindow.parent.document.getElementById("mainframe").src=result;
}
}
httpRequest.send(null);
}
}

httpRequest.responseText得到的字符串是:
PrintWriter writer = response.getWriter();
writer.print("ok");
得到的字符串就是"ok"/.