​x
 
<!DOCTYPE html>
<html>
<body>
​
<h2>JavaScript 对大小写敏感</h2>
​
<p>请试着把 lastName 改为 lastname。</p>
​
<p id="demo"></p>
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<script>
var lastname, lastName;
lastName = "Gates";
lastname = "Jobs";
document.getElementById("demo").innerHTML = lastName;
</script>
​
</body>
</html>
​