一些脚本代码！我有点看不懂

希望回答者能逐句解释：这样我会更明白些
!谢谢


function show_popup()
{
var p=window.createPopup()
var pbody=p.document.body
pbody.style.backgroundColor="lime"
pbody.style.border="solid black 1px"
pbody.innerHTML="This is a pop-up! Click outside the pop-up to close."
p.show(150,150,200,50,document.body)
}