<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<script type="application/javascript">
var a=1;
var b=2;
function pi(){
a='1'+2+'3'+4;
alert(a);
}
function bi(){
b=4+3+2+"1";
alert(b);
}
pi();
bi();
</script>
<body>
</body>
</html>
答案是 1234 91
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