为什么这么写 运算的结果不对呢比如1000+10000 =2000了。。。，谁给解释下呢？
<script type="text/javascript">
function count(){
var t1= document.getElementById("txt1").value;
var t2= document.getElementById("txt1").value;
var slt = document.getElementById("select").value;
var rlt = "";
switch(slt){
case "+":
rlt = parseInt(t1) + parseInt(t2);
break;
case "-":
rlt = parseInt(t1) - parseInt(t2);
break;
case "*":
rlt = parseInt(t1) * parseInt(t2);
break;
case "/":
rlt = parseInt(t1) / parseInt(t2);
break;
}
document.getElementById("fruit").value = rlt;
}
</script>
