纯粹的 AJAX

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function saveInfo() {
	var XHR = null;
	var FD = new FormData();
	var name = document.getElementById("name").value;

	if (window.XMLHttpRequest)
		XHR = new XMLHttpRequest();
	else if (window.ActiveXObject)
		XHR = new ActiveXObject("Microsoft.XMLHTTP");
	
	FD.append("name", name);
	
	XHR.onreadystatechange = function ()
	{
		if (XHR.readyState == 4 && XHR.status == 200)
		{
			var text = XHR.responseText; // 返回的文本
		}
	}
	
	XHR.open('POST', 'index.php', true)
	XHR.send(FD);
}

以云笺保存信息的函数为例：

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function saveInfo() {
	var XHR;
	var FD = new FormData();
	var name = document.getElementById("name").value;
	var info = document.getElementById("info").value;
	
	if (name == "") return ;
	// 去掉首尾空格
	var noblank_name = name.replace(/(^\s*)|(\s*$)/g,"");
	if (noblank_name != name){
		name = noblank_name;
		document.getElementById("name").value = name;
	}
	
	XHR = null;
	
	if (window.XMLHttpRequest)
	{
		XHR = new XMLHttpRequest();
	}
	else if (window.ActiveXObject)
	{
		XHR = new ActiveXObject("Microsoft.XMLHTTP");
	}
	
	FD.append("name", name);
	FD.append("info", info);
	
	XHR.onreadystatechange = function ()
	{
		if (XHR.readyState == 4 && XHR.status == 200)
		{
			mdui.snackbar({
				message: '保存成功',
				buttonText: '历史',
				onButtonClick: function() {
					window.open("index.php?h=1&n=" + encodeURI(name));
				},
			});

			save_time = (new Date()).getTime();
			save_text = info;
		}
	}
	
	XHR.open('POST', 'index.php', true);
	
	XHR.send(FD);
	
	document.getElementById('info').focus();
	
	return false;
}

jQuery用法

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// 实时聊天获取头像例子
function get_head(fromid, toid) {
    $.post(
    	API_URL+"getHead",					// 网址
        {"fromid":fromid, "toid":toid},		// 数据
        function(e) {						// 返回后
            from_head = e.from_head;
            to_head = e.to_head;
        }, "json"							// 格式是 json
    );
}