function busUpLoadImg(postUrl,id) {
    .......//省略部分不用修改
　　uploader.on(‘uploadSuccess‘, function(file) {
        $(‘#‘ + file.id).addClass(‘upload-state-done‘);
        //验证是否上传上传
        oSuccess = true;
    });
//回调函数验证是否上传
    var oSuccess = false;
    return function(){
        return oSuccess;
    }
}

<input type="text" />
<input type="submit" onclick="subMit()" />

function subMit(){
    fn1 = busUpLoadImg("postUrl",1);
    fn2 = busUpLoadImg("postUrl",2);

　　if(!(fn1() && fn2())){
     　　layer.msg("请上传图片",{time:1500});
     　　return false;
　　}      
}