var postInstall=function(data,fn){                           //发送请求	var xhr = new XMLHttpRequest();	var url="";              //地址，注意不要跨域	xhr.open("post", url);	xhr.setRequestHeader("content-type", "application/json");	xhr.onreadystatechange = function() {		if(xhr.readyState == 4) {			var str=xhr.responseText;			console.log(str);			var obj=JSON.parse(str);			if(typeof(fn)=="function"){				fn(obj);			}		}	}	data=http://www.mamicode.com/JSON.stringify(data);>var Timer=setInterval(function(){
 var xhr = new XMLHttpRequest();
 var url="";
 xhr.open("GET", url);
 xhr.setRequestHeader("content-type", "application/json");
 xhr.onreadystatechange = function() {
  if(xhr.readyState == 4) {
  }
 }
},2000);              // 200秒内持续document.addEventListener(‘click‘,function(evt){	if(!evt.target.matches(".yes")){		return;	}	var data=http://www.mamicode.com/{                                         //发送的数据"environ").checked,    		keystone:document.getElementById("keystone").checked,		glance:document.getElementById("glance").checked,	}	postInstall(data,function(resdata){		if(resdata.status=="OK"){			alert("发送成功")；		}	});});