js实现PC端与客户端自适应

var newDoc=document.open("text/html","replace"); //重新加载引入
	window.onload=function(){
	//进入判断页面
	changeDivHeight();
	}
	window.onresize=function(){
	//监听页面宽度值
	changeDivHeight();
	}
	//执行判断命令
	function changeDivHeight(){
	//获取body的宽度
	var h = document.body.clientWidth
	console.log(h);
	if(h < 800)
	{
	//移动端
	document.getElementById('css').href='css/ydd.css' //移动端
	panddh('yddaohang')
	newDoc.close();
	}
	else
	{
	//PC端
	document.getElementById('css').href='css/PCd.css' //PC端
	panddh('pcdaohang')
	newDoc.close();
	}
	}
	//判断移动端 还是pc端 显示导航
	function panddh(id){
	if(id=='pcdaohang')
	{
	document.getElementById('pcdaohang').style.display="block";
	document.getElementById('yddaohang').style.display="none";
	}
	else
	{
	document.getElementById('pcdaohang').style.display="none";;
	document.getElementById('yddaohang').style.display="block"
	}
	}