​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript 变量</h1>
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<p>字符串用引号包围。</p>
<p>数值不用引号包围。</p>
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<p id="demo"></p>
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<script>
var pi = 3.14;
var person = "Bill Gates";
var answer = 'How are you!';
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document.getElementById("demo").innerHTML =
pi + "<br>" + person + "<br>" + answer;
</script>
​
</body>
</html>
​