"TypeError: Unable to set undefined or null-referenced property "onMessage"" -IE10

[huangxin290]

Very strange bug, when it is used in a child component, it will report an error and the page will not display, but when it is used in an individual page, it will report an error but the page will display

this.$options.sockets.onmessage = data => {
      const msg = JSON.parse(data.data)
      if (msg.purpose === 'xxx')  this.loadData()
}

this.loadData() is a a Ajax function that gets the data

error message: [Vue warn]: Error in mounted hook: "TypeError: Unable to set undefined or null-referenced property "onMessage""