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1 、get是把参数数据队列加到提交表单的ACTION属性所指的URL中，值和表单内各个字段一一对应，在URL中可以看到。post是通过HTTP
post机制，将表单内各个字段与其内容放置在HTML HEADER内一起传送到ACTION属性所指的URL地址。用户看不到这个过程。
2、get传送的数据量较小，不能大于2KB。post传送的数据量较大，一般被默认为不受限制。但理论上，因服务器的不同而异。
3、<form method="get" action="a.asp?b=b">跟<form method="get" action="a.asp">
是一样的，也就是说，method为get时action页面后边带的参数列表会被忽视；而<form method="post"
action="a.asp?b=b">跟<form method="post" action="a.asp">是不一样的。
4、get请求需注意缓存问题，post请求不需担心这个问题（get方式请求的数据会被浏览器缓存起来，因此其他人就可以从浏览器的历史记录中读取到这些数据，例如账号和密码等。某种情况下，get方式会带来严重的安全问题。而post方式相对来说就可以避免这些问题
）
使用get方式需要注意：
4.1、缓存 在url?后面链接一个随机数，时间戳
4.2、乱码 编码encodeURI
对于get请求，被传递的参数要先经encodeURIComponent方法处理，例如：xhr.open(‘get’,‘2.get.php?username
= ‘+encodeURIComponent(leo)+’&age=30&’+new
Date().getTime(),true);即get传递参数需要拼接到url当中(new Date().getTime()是添加的时间戳)。
使用post方式需要注意：
4.3、数据放在send()里面作为参数传递。例：xhr.send(‘username=leo&age=30’);
4.4、需要设置requestHeader的content-type为application/x-www-form-urlencoded申明发送的数据类型。例：xhr.setRequestHeader(‘content-type’,‘application/x-www-form-urlencoded’);
所以post没有缓存问题，也无需编码
5、用下面的例子可以很容易的看到同样的数据通过GET和POST来发送的区别，发送的数据是 username=张三。
