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Vue 命令执行多次问题

问题：在Vue框架中，重写命令导致执行多次的问题如何解决？

背景：

用户使用在线表格编辑器时，常见有自定义的需求，例如排序，可以自定义排序规则；粘贴，自定义粘贴内容，过滤不想粘贴的内容，如下代码所示：

            var designer = new GC.Spread.Sheets.Designer.Designer(document.getElementById("designerHost"));
            var spread = designer.getWorkbook();
            var sheet = spread.getActiveSheet();

            let designerConfig = JSON.parse(JSON.stringify(GC.Spread.Sheets.Designer.DefaultConfig));
            var command = GC.Spread.Sheets.Designer.getCommand('sortAZ');
            var oldExecute = command.execute;
            command.execute = function (context, propertyName){
                console.log('Designer排序事件' ,context, propertyName)
                oldExecute.call(this,context, propertyName)
            }

            designerConfig.commandMap = {
                "sortAZ":command
            }
            designer.setConfig(designerConfig)

在获取‘sortAZ’命令后，重写execute方法，在此方法中打印了参数，用户可以根据自己的需要重写execute方法。

此时有的小伙伴发现，在Vue框架中，初始化Designer后，重写命令，发现会执行多次。如这篇帖子中，用户重写右键粘贴，在exceute方法中，让其弹窗，发现多次点击多次弹窗。

又比如这位用户的帖子，重写了导入文件的相关逻辑，发现路由跳转后，会执行两次，再次路由跳转后，执行三次，依此类推。

原因：

用户想要改写的命令是从全局静态命令映射（GC.Spread.Sheets.Designer.getCommand）中获取，然后，由客户覆盖，并注册回全局静态命令映射。

那么，下一次，客户得到的命令就是之前已经改写覆盖了的命令。

解决方案：

为此有一个解决方案就是：不要在设计器初始化逻辑中写这个一次性逻辑，它只需要一次。

那么怎么只执行一次呢？这个也很简单，简而言之就是加把锁，desiigner初始化后执行一次，第二次不执行。如下代码：

在获取命令后，加一行if语句判断：

if(!commandName.flag){}

因为commandName 此命令没有flag属性，所以其flag值是undefined ,第一次执行的时候，判断!commandName.flag 就可以进入自定义的execute命令。

待execute()执行完成，重写command对象后，此时可以设置flag属性为true。

commandName.flag = true

这样子就保证了执行一次，解决执行多次问题。

作者: Ellia.Duan | 审核：Clark.Pan | 更新时间：2023.11.06