let params = Object.assign({username:this.username},values)
assign是将括号中所有参数合并,并赋值给params,如下图所示
values={"oldpassword":"COMAC.123","password":"123456","confirmpassword":"123456"}
params={username: "admin", oldpassword: "COMAC.123", password: "123456", confirmpassword: "123456"}