mySubmit.js

function mySubmit(theForm,url,result){
    function default_callback(res){
        result.html(res.info);
        if(res.status=='1'){
            if(res.url!=''){
                location.href = res.url;
            }else{
                window.setTimeout(function(){
                    result.html('');
                    document.getElementById(theForm).reset();
                },2000);
            }
        }
    }

    if(url && typeof(url)=='string'){
        var callback = arguments[3] || default_callback;
    }else{
        var callback = arguments[1] || default_callback;
        url = $('#'+theForm).prop('action');
    }

    if(result){
        var result = $('#'+result); 
    }else if($('#result').length>0){
        result = $('#result');
    }else{
        result = $("<font class='tip' color='red' id='result'></font>");
        $('#'+theForm).append(result);
    }
    result.html('处理中……');

    var formdata = null;
    try{
        formdata = new FormData();
    }catch(ex){}

    var filedata = $('#'+theForm+' input[type="file"]');

    if(filedata.length>0 && !formdata){
        alert('你的浏览器版本太低，请升级浏览器或使用其他浏览器（例如：chrome浏览器）！');
        return false;
    }

    filedata.each(function(){
        var _this = this;

        if(_this.files.length==1){//单文件上传
            var file = _this.files[0];
            formdata.append(_this.name,file);
        }else if(_this.files.length>1){//多文件上传
            for (var i=0,len=_this.files.length; i<len; i++) {
                var file = _this.files[i];
                formdata.append(_this.name+'['+i+']',file);
            };
        }
    });

    if(!formdata){
        formdata = $('#'+theForm).serialize();
    }else{
        var data = $('#'+theForm).serializeArray();

        for(var i=0,len=data.length; i<len; i++){
            formdata.append(data[i]['name'], data[i]['value']);
        }
    }

    $.ajax({
        url:url,
        type:'post',
        data:formdata,
        processData:false,
        contentType:false,
        dataType:'json',
        success:callback
    });

    return false;
}