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求教呀 大神们getJSON 问题

function getJSONs(url,timeStr,str,startFlag,doRequest){
    var len = str.length;
    var value;
    var packNum = Math.ceil(len/900);
    var dataParam;

    if(packNum>1){
        value = str.substr(0, 900);
        str = str.substr(900, len);
        if(startFlag){
            dataParam = {
                startFlag   :   'yes',
                value       :   value,
                timeStr     :   timeStr
            }
        }else{
            dataParam = {
                value       :   value,
                timeStr     :   timeStr
            }
        }
    }else if(packNum==1){
        value = str;
        str = "";
        if(startFlag){
            dataParam = {
                startFlag   :   'yes',
                value       :   value,
                timeStr     :   timeStr,
                finishFlag  :   'yes'
            }
        }else{
            dataParam = {
                value       :   value,
                timeStr     :   timeStr,
                finishFlag  :   'yes'
            }
        }
    }
    jQuery.getJSON(url,dataParam, function(data){
        if(str==""){
            doClientRequest(doRequest,data);
        }else{
            getJSONs(url,timeStr,str,false,doRequest);
        }
    });
}

以上是神马意思? --------------------编程问答-------------------- JS方法定义调用
补充:Java ,  Web 开发
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