<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>菜鸟教程(runoob.com)</title>

</head>

<body>

<p>点击这里来创建变量，并显示结果。</p>

<button onclick="myFunction()">点击这里</button>

<p id="demo"></p>

<script>

function myFunction(){

    var carname="Volvo";

    document.getElementById("demo").innerHTML=carname;

}

</script>

</body>

</html>

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>菜鸟教程(runoob.com)</title>

</head>

<body>

<p>假设 y=5，计算 x=y+2，并显示结果。</p>

<button onclick="myFunction()">点击这里</button>

<p id="demo"></p>

<script>

function myFunction(){

    var y=5;

    var x=y+2;

    var demoP=document.getElementById("demo");

    demoP.innerHTML="x=" + x;

}

</script>

</body>

</html>

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>菜鸟教程(runoob.com)</title>

</head>

<body>

<script>

var x=5;

var y=6;

var z=x+y;

document.write(x + "<br>");

document.write(y + "<br>");

document.write(z + "<br>");

</script>

</body>

</html>

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>菜鸟教程(runoob.com)</title>

</head>

<body>

<script>

var pi=3.14;

var name="Bill Gates";

var answer='Yes I am!';

document.write(pi + "<br>");

document.write(name + "<br>");

document.write(answer + "<br>");

</script>

</body>

</html>

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