版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/jal517486222/article/details/81459542
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>
RunJS 演示代码
</title>
<script>
var ck = function(){
var x = prompt ("输入昵称: ", "Tom");/*第一个变量为提示语，第二个变量为默认初始值*/
alert(x);
}
</script>
</head>
<body>
<button onclick="ck();">
click
</button>
</body>
</html>