一、ajax与PHP交互

注意：[{},{},{}]是json数组

1、ajax

$(function(){
$('#send').click(function() {
$.ajax({
type: "GET",
url: "ajax3.PHP",
data:{"a":"b","b":"a"},
dataType: "json",
success : function(data){
alert(data.length);
}
});
});
})

2、ajax3.PHP

<?PHP header("Content-Type:text/html; charset=utf-8"); echo "[{ \"username\" : \"{$_REQUEST['a']}\",\"content\" : \"{$_REQUEST['b']}\"},{ \"username\" : \"{$_REQUEST['a']}\",\"content\" : \"{$_REQUEST['b']}\"}]" ?>