-----注意外部js文件一定保存格式为“utf_8 有格式”
<script> var jqa =$; </script>
<script> var jqa = jQuery.noConflict(true); </script>
var $ jqa=$.noConflict();
--------------如下 $不起作用、别名起作用
<!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" />
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js"></script>
<script> var jqa = jQuery.noConflict(true); </script>
<script src="https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script> var jqb = jQuery.noConflict(true); </script>
<title>无标题文档</title>
</head>
<body>
<input type="submit" name="butid" id="butid" value="提交" onclick="mes()" />
<script>
function mes()
{alert('我是a库'+jqa('#butid').val())
alert('我是b库'+jqb('#butid').val())
}
</script>
</body>
</html>
或者--------------如下 $、与别名都起作用
<!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" />
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js"></script>
<script> var jqa = $; </script>
<script src="https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script> var jqb = $; </script>
<title>无标题文档</title>
</head>
<body>
<input type="submit" name="butid" id="butid" value="提交" onclick="mes()" />
<script>
function mes()
{alert('我是a库'+jqa('#butid').val())
alert('我是b库'+jqb('#butid').val())
}
</script>
</body>
</html>