aja传出json

有些时候jquery调用json数据是很方便的

function AddComment(content) { 
    var threadId = $("#span_thread_id").html(); 
    var groupId = $("#span_group_id").html(); 
    var groupType = $("#span_group_type").html(); 
    var title = $("#thread_title").html(); 
    var content = content.replace(/\x22/g,'"'); 
    $.ajax({ 
        url: '/WebService/GroupService.asmx/AddThreadComment', 
        data: '{threadId:' + threadId + ',groupId:' + groupId + ',groupType:' + groupType + ',title:"' + title + '",content:"' + content + '"}',        type: 'post', 
        dataType: 'json', 
        contentType: 'application/json;charset=utf-8', 
        cache: false, 
        success: function(data) { 
            //根据返回值data.d判断是不是成功 
        }, 
        error: function(xhr) { 
            //中间发生异常，查看xhr.responseText 
        } 
    }); 
} 

可是再构造json数据串的时候很麻烦，容易出错。用下面的方法处理构造json数据字符串 ，很巧妙

function AddComment(content) { 
    var comment = {}; 
    comment.threadId = $("#span_thread_id").html(); 
    comment.groupId = $("#span_group_id").html(); 
    comment.groupType = $("#span_group_type").html(); 
    comment.title = $("#thread_title").html(); 
    comment.content = content; 
    $.ajax({ 
        url: '/WebService/GroupService.asmx/AddThreadComment', 
        data: $.toJSON(comment), 
        type: 'post', 
        dataType: 'json', 
        contentType: 'application/json;charset=utf-8', 
        cache: false, 
        success: function(data) { 
            //根据返回值data.d处理    
        }, 
        error: function(xhr) { 
            //中间发生异常，具体查看xhr.responseText 
        } 
    }); 
}