function jisuan()
	{
		var x=document.getElementById("shu1").value;
		var y=document.getElementById("shu2").value;
		x=parseInt(x);
		y=parseInt(y);
     if(!isNaN(x)&&!isNaN(y)){ 
    	var yuanjia=x+y;
		document.getElementById("jieguo").innerHTML=yuanjia;
    }else{
      alert("不是数字类型!");
    }
		
	}