表单sku

Sku字段中有图片，需自行实现

可以复制form/sku.php代码至自己项目目录，自行修改代码。调用时传file字段完整的sku.php路径。

在点击时触发

upload_spec_field 
upload_spec_index  

两个值会有变化

例如

think_vue_media($vue,"
if(app.upload_spec_field == 'sku'){
    for(let i in dd){
        if(dd[i] && dd[i].url){
            this.form[this.upload_spec_field][this.upload_spec_index].img = dd[i].url;   
            return;       
        } 
    }   
}"," 
    this.selected_media_use_muit = false; 
");