<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>逻辑与</title>
<script type="text/javascript">
var numa,numb;
numa=60;
numb=70;
if(true == numa >= 60 && numb >= 60)
{
document.write("JavaScript考核通过!"+"<br>");
}
</script>
</head>
<body>
</body>
</html>
这个if 里面不用加true==
先和你说一下,你这样写是可以的,但是我们程序是有一个执行的先后顺序的,你可以像我这样写就好了
<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>逻辑与</title><script type="text/javascript"> var numa,numb; numa=60; numb=70; if(numa>=60==true&&numb>=60==true) { document.write("JavaScript考核通过!"+"<br>"); }</script></head><body></body></html>