简单js与php交互，简单jsphp

简单js与php交互，简单jsphp

php

//JSon格式头：
header("Content-type:application/json")
//php连接数据库
$conn=mysql_connect("url","username","password");
//php选择数据库
mysql_select_db("dbname",$conn);
//设置编码
mysql_query("set names utf8",$conn);
//从表中取出数据
$rule=mysql_query("select * from tb");
//创建结果变量
$result=array();
//输出数组
while($row=myaql_fetch_array($rule)){
    array_push($result,$row)
}
print_r($result)
//输出json
while($row=myaql_fetch_assoc($rule)){
    $result[]=$row
}
echo json_encode($result)

• print_r用于输出数组与对象，echo 和print用于输出字符串

---

ajax

//创建request对象
var request;
if(window.XMLHttpRequest){
    request=new XMLHttpRequest()
}else{
    request=new ActiveXObject(Miscrosoft.XMLHTTP)
}
//创建参数parma
var parma;
//GET请求
request.open("GET",url+"?"+parma,true);
request.send();
//POST请求
request.open("POST",url,true);
requset.setRequestHeader("Content-tyep","application/x-www-form-urlencoded");
request.send(prama);
//结果与回复
request.onreadystatechange=function(){
    if(request.readyStage=4&&request.status==200){
        success()
    }else{
        fail()
    }
}