<!DOCTYPE html><html> ???<head> ???????<meta charset="utf-8"> ???????<title></title> ???</head> ???<body> ???????<script type="text/javascript"> ???????????//变量作用域 ???????????var x=1; ???????????function test(){ ???????????????document.write(‘函数体内x的值为:‘+x+‘<br/>‘); ???????????//undefined,x值取下面的,但是取不到值 ???????????????var x=19; ???????????????document.write(‘函数体内对x重新赋值,此时x的值为:‘+x+‘<br/>‘); ???????//19 ???????????} ???????????document.write(‘函数体外x的值为:‘+x+‘<br/>‘); ???????????????//1 ???????????test(); ???????????document.write(‘x的值为:‘+x+‘<br/>‘); ???????????????????????//1 ???????????//document.write(‘<hr color="red"/>‘); ???????????????????</script> ???</body></html>
JS函数03
原文地址:https://www.cnblogs.com/f-z-g-boke/p/9545438.html