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var car = "Fiat";

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var car = {type:"Fiat", model:500, color:"white"};

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  <!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
</head>
<body>
<p id="demo"></p>
<script>
var person = {firstName:"jack", lastName:"chen", age:35, height:"183cm"};
document.getElementById("demo").innerHTML =
person.firstName + " 現(xiàn)在 " + person.age + " 歲.";
</script>
</body>
</html>
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> </head> <body> <p id="demo"></p> <script> var person = {firstName:"jack", lastName:"chen", age:35, height:"183cm"}; document.getElementById("demo").innerHTML = person.firstName + " 現(xiàn)在 " + person.age + " 歲."; </script> </body> </html>