原生js访问json

			var xml;
			if (window.XMLHttpRequest) {  
				xml = new XMLHttpRequest();  
			}else if(window.ActiveXObjec) {  
				xml = new ActiveXObject("Microsoft.XMLHTTP");  
			}
			if (xml != null) {
				xml.onreadystatechange = function() {
					if (xml.readyState == 4 && xml.status == 200) {
						var obj = JSON.parse(xml.responseText);
						for(var name in obj){
							console.log(obj[name])
						}
					}
				}
				xml.open("POST","index.php",true);
				xml.send();
			}