前面AJAX及后端PHP处理的代码，其中包含了处理JSON数据的方法、加载样式的loading效果、防止重复操作的禁用按钮功能。

function showshibie(){
    zc_code=$("#zc_code").val()
	
    if (zc_code==''){
        alert_go('请输入资产编号！','alert','','error','')
        return false
    }else{
		$('#but11').attr("disabled","disabled"); 
		$('#but11').addClass("disabled"); 
        $("#cz_tishi").html('<span><img src="images/16.gif" border="0" /> 请稍后，正在读取...</span>');
        setTimeout(function(){
			
			$.ajax({
				type: "POST",
				timeout:10000, // 设置超时时间10秒
				url: "weixiu_function.php",
				contentType: "application/json", //如果提交的是json数据类型，则必须有此参数,表示提交的数据类型 
				dataType: "json", //表示返回值类型，不必须。如果注释掉表示字符型
				data: JSON.stringify({
					"action": 'get',
					"zc_code": zc_code
				}),
				success: function(jsonResult) {
				
					var back_status = jsonResult.back_status;
					
					
					if (back_status == 'error') { //错误
						
						var back_message = jsonResult.back_message;
	
						$("#cz_tishi").html(back_message)
						$("#cz_tishi").css("color","#FF0000");
						$('#but11').removeAttr("disabled");
						$('#but11').removeClass("disabled"); 
						
						return false;
						
					} else if (back_status == 'ok') { //正常
						
						var zc_code = jsonResult.zc_code;
						var pinming = jsonResult.pinming;
						var guige = jsonResult.guige;
						
						$("#zc_bianhao").val(zc_code);
						$("#pingming").html(pinming);
						$("#guige").html(guige);
						
						$("#cz_tishi").html('');
						$("#cz_tishi").css("color","green");
						$('#but11').removeAttr("disabled");
						$('#but11').removeClass("disabled"); 

					}
				},
	
				error: function(data) {
					$("#cz_tishi").html('error')
					$("#cz_tishi").css("color","#FF0000");
					$('#but11').removeAttr("disabled");
					$('#but11').removeClass("disabled"); 
					return false;
				}
	
			});
			
			return false
		
		
        },400);
		
		
		
    }
}

PHP后台处理代码：

<?php

$post_val=file_get_contents('php://input');//jq ajax的json数据用此方法接收
$post_str=json_decode($post_val, true);
$action=$post_str['action'];
$zc_code=$post_str['zc_code'];

if ($action=='get'){
	
	if (strpos($zc_code,"-")===false){
		echo '{"back_status":"error","back_message":"资产编码格式错误，请完整输入！"}';
		exit;
	}
	
	$biaoji=explode('-',$zc_code);
	if ($biaoji[0]=='FGZ'){
		$select_table='dangxiao_zichan_guzi_1';
		$select_pm_table='dangxiao_zichan_fenlei';
		
	}elseif ($biaoji[0]=='GZ'){
		$select_table='dangxiao_zichan_guzi_2';
		$select_pm_table='dangxiao_zichan_fenlei_guzi';
		
	}

	
	if ($biaoji[0]=='GZ' || $biaoji[0]=='FGZ' ){
	
		$sql_2="select id,pinming,guige from ".$select_table." where zhangtao='".$_SESSION['dangxiao_zc_zhangtao']."' and id='".$biaoji[1]."' limit 1 ";
		$result_2=$mysqli->query($sql_2);
		if ($rs_2=$result_2->fetch_assoc()){
			$guige=$rs_2["guige"];
			$id=$rs_2["id"];
			$pinming=$rs_2["pinming"];
			
			$sql_1="select biaoqian from ".$select_pm_table." where zhangtao='".$_SESSION['dangxiao_zc_zhangtao']."' and id='".$pinming."' limit 1 ";
			$result_1=$mysqli->query($sql_1);
			if ($rs_1=$result_1->fetch_assoc()){
				$biaoqian=$rs_1["biaoqian"];
			}
			
			echo '{"back_status":"ok","zc_code":"'.$zc_code.'","pinming":"'.$biaoqian.'","guige":"'.$guige.'"}';//因为要往每行写内容，所以要返回变量而非message内容
			exit;
	
		}else{
			echo '{"back_status":"error","back_message":"资产编号【'.$zc_code.'】不存在，请核对！"}';
			exit;
		}
	}
	
	if ($biaoji[0]=='QT'){
		$sql_2="select id,guige,danwei_wz,biaoqian from dangxiao_zichan_fenlei_qita where zhangtao='".$_SESSION['dangxiao_zc_zhangtao']."' and id='".$biaoji[1]."' limit 1 ";
		$result_2=$mysqli->query($sql_2);
		if ($rs_2=$result_2->fetch_assoc()){
			$guige=$rs_2["guige"];
			$id=$rs_2["id"];
			$biaoqian=$rs_2["biaoqian"];
			
			echo '{"back_status":"ok","zc_code":"'.$zc_code.'","pinming":"'.$biaoqian.'","guige":"'.$guige.'"}';//因为要往每行写内容，所以要返回变量而非message内容
			exit;
	
		}else{
			echo '{"back_status":"error","back_message":"资产编号【'.$zc_code.'】不存在，请核对！"}';
			exit;
		}
	}
		
}

?>