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js:
var str = '<p style="color:red;">你好</p>';
$.ajax({
    url:'./yoururl',
    data:{'str':str},
    type:'post',
    dataType:'json',
    beforeSend:function(){
        //
    },
    success:function(res){
        if(res.status == 0){
            //成功
        }else{
            alert(res.message);
        }
    }
})

php:

$str = isset($_POST['str'])?trim($_POST['str'])?:'';
if($str){
    echo json_encode(array('status'=>0,'message'=>'ok'));
}else{
    echo json_encode(array('status'=>-1,'message'=>'接收失敗'));
}
die;