<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script type="text/javascript">
confirm("你好")；//confirm翻译为确定，证实所以这个是选择的
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script type="text/javascript">
function run1()
{
alert("run");
}
setInterval("run()",100);
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script type="text/javascript">
function str (n,a)
{
this.name = n;
this.age = a;
}
var p = new str("晨昊","5");
alert(p.name);
p.sex = "男";
alert(p.sex);
//有两种方法js相比于java来说，语言不需要太高的精度
//在外面直接声明也可以直接套过来使
</script>
</head>
<body>
</body>
</html>
原文：https://www.cnblogs.com/shuangshuangzi/p/15082996.html