Mongoose allows you to configure custom setters in which you do the comparison. pre(‘save’) by itself won’t give you what you need, but together:
schema.path(name).set(function (newVal) {var originalVal this.name;if (someThing) {this._customState tru…
Android studio新建项目xml文件不显示Preview问题解决方法
报错如下:
1、The following classes could not be instantiated:
2、The following classes could no
3、Failed to load AppCompat ActionBar with unknown error.
找到values文件夹下面的styles.xm…