学习php+mysql+ajax局部刷新点赞/取消点赞功能

连接数据库

$con = new mysqli('localhost','root','','test');
	if (!$con)
	{
	 die('连接数据库失败，失败原因：' . mysqli_error());
	}else {
	 // echo "连接成功";
	}

对用户是否点赞进行判断（操作页面）

对数据库的信息进行提取

//假设用户编号为1
	$uId="1";
	
	//假设赞编号为1
	$zanId="1";
	
	//查找赞id为1的点赞数
	$count=mysqli_query($con, "SELECT count FROM zanCount WHERE zanId=$zanId ");
	$countResult=mysqli_fetch_array($count);
	$countZan=$countResult['count'];
	
	//查找改用户是否对赞id为1 点赞
	$uIdLike=mysqli_query($con, "SELECT * FROM zanRecord WHERE uId=$uId ");
	$result=mysqli_fetch_array($uIdLike);

对用户是否点赞进行判断，并输出不同的html

//点赞
if (isset($result)) 
	{
	 $showZan.=<<
		 
		 $countZan
  

html;
	 
	 
	}
	//没点赞
	else
	{
	 $showZan.=<<
		 
		 $countZan
 

html;
	}
	echo $showZan;
 ?>

css样式

#dolike, #donolike 
{ 
 width:30px;
 height:30px; 
 margin-left:20px;
 float:left;}
#donolike 
{
background:url(./images/nolike.png); 
background-size:30px 30px; 
}
#dolike
{
background:url(./images/like.png);
 background-size:30px 30px; 
 }

调用的ajax方法

传递需要的数据，这里传递的时zanId 和uId
记得引入jq文件
点赞

function zan()
{
	$.ajax({
		type:"POST",
		url:"./likeSever.php",
		data:{'zanId':$("#zanId").val(),'uId':$("#uId").val()},
		success:function(text){
			$("#dolikep").html(text);
		}
	});
	
}

取消点赞

function zanDel()
{
	$.ajax({
		type:"POST",
		url:"./disSever.php",
		data:{'zanId':$("#zanId").val(),'uId':$("#uId").val()},
		success:function(text){
			$("#dolikep").html(text);
		}
	});
	
}

处理代码

点赞处理

//更新赞总数的数据
 mysqli_query($con,"UPDATE zanCount SET count = count+1 WHERE zanId=$zanId");
 
 //添加一条点赞记录 
 mysqli_query($con,"INSERT INTO zanRecord(zanId,uId) VALUES($zanId, $uId); ");
 
 //查找赞的总数
 @$count=mysqli_query($con, "SELECT count FROM zanCount WHERE zanId=$zanId ");
 @$countResult=mysqli_fetch_array($count);
 @$countZan=$countResult['count'];
 
 //更改输出的html
 $show="";
 $show=<<
		$countZan
html;
 echo $show;

取消点赞处理

//更新赞总数的数据
 mysqli_query($con,"UPDATE zanCount SET count = count-1 WHERE zanId=$zanId");
 
 //添加一条点赞记录
 mysqli_query($con,"DELETE FROM zanRecord WHERE zanId=$zanId AND uId=$uId ");
 
 //查找赞的总数
 @$count=mysqli_query($con, "SELECT count FROM zanCount WHERE zanId=$zanId ");
 @$countResult=mysqli_fetch_array($count);
 @$countZan=$countResult['count'];
 
 //更新html
 $show="";
 $show.=<<
		$countZan
html;

点赞的图片
图片自己画的，有点不太美观

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