写接口的话，无非就为了让移动端，WEB端，或者是PC Client调用。
我们写个返回JSON格式的接口，功能是关于四则运算。
<?PHP
header('Content-type:application/json');
$operator = $_GET['operator'];
$first = $_GET['first'];
$second = $_GET['second'];
if($operator == 'jia'){ //加法
$result =$first+$second;
}
else if($operator == 'jian'){ //减法
$result = $first-$second;
}
else if($operator == 'cheng'){ //乘法
$result = $first*$second;
}
else{ //除法
$result = $first/$second;
}
$result = array('res'=>$result,'status'=>1);
echo json_encode($result);//返回JSON数据格式
?>
<!DOCTYPE html> <Meta charset='utf-8'> <script></script> <center> <input type='text' name='first' id='first'> <input type='text' name='second' id='second'> <hr> <button value='jia' >加法</button> <div id='jia'></div> <hr> <button value='jian' >减法</button> <div id='jian'></div> <hr> <button value='cheng' >乘法</button> <div id='cheng'></div> <hr> <button value='chu' >除法</button> <div id='chu'></div> </center> <script src='jquery.js'></script> <script> $(function(){ $('button').click(function(){ var first = $('#first').val(); var second = $('#second').val(); var operator = $(this).val(); var area = operator; var query = 'http://localhost/api.PHP/?'+'first='+first+'&second='+second+'&operator='+operator; $.get(query,'',function(data,st){//$.get(我们要输入的URLget串，参数留空，callback) $('#'+area).text(data.res); //按了哪个运算的按钮，就要在该区域赋值 }); }); }); </script>
原文链接：https://www.f2er.com/ajax/163935.html