JSON我实在不("(" + txt + ")")的意思，为什么搞那么多+号和‘号？

<!DOCTYPE html>

<html>

<head>

<title>菜鸟教程(runoob.com)</title>

</head>

<body>

<h2>从 JSON 字符串中创建对象</h2>

<p>

名: <span id="fname"></span><br>

姓: <span id="lname"></span><br>

</p>

var txt = '{"employees":[' +

'{"firstName":"John","lastName":"Doe" },' +

'{"firstName":"Anna","lastName":"Smith" },' +

'{"firstName":"Peter","lastName":"Jones" }]}';

var obj = eval ("(" + txt + ")");

document.getElementById("fname").innerHTML=obj.employees[1].firstName

document.getElementById("lname").innerHTML=obj.employees[1].lastName

</script>

</body>

</html>

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