mpvue开发微信小程序，分享按钮报错：`Cannot read property 'apply' of null`

用mpvue开发微信小程序，分享按钮报错：Cannot read property 'apply' of null

thirdScriptError
Cannot read property 'apply' of null;at pages/commit-done/index page onShareAppMessage function
TypeError: Cannot read property 'apply' of nullat t.l (http://127.0.0.1:40968/appservice/__dev__/WAService.js:18:7100)at cn (http://127.0.0.1:40968/appservice/__dev__/WAService.js:19:9477)at Function.un (http://127.0.0.1:40968/appservice/__dev__/WAService.js:19:10438)at http://127.0.0.1:40968/appservice/__dev__/WAService.js:18:9835at http://127.0.0.1:40968/appservice/__dev__/WAService.js:19:11296at n (http://127.0.0.1:40968/appservice/__dev__/WAService.js:5:30424)at a (http://127.0.0.1:40968/appservice/appservice?t=1534209702568:3511:9566)at e.registerCallback (http://127.0.0.1:40968/appservice/appservice?t=1534209702568:3511:9753)at n.forEach (http://127.0.0.1:40968/appservice/appservice?t=1534209702568:3511:5638)at Array.forEach ()
console.error @ VM5516:1
errorReport @ WAService.js:4
thirdErrorReport @ WAService.js:4
(anonymous) @ WAService.js:3
l @ WAService.js:18
cn @ WAService.js:19
un @ WAService.js:19
(anonymous) @ WAService.js:18
(anonymous) @ WAService.js:19
n @ WAService.js:5
a @ appservice?t=1534209702568:3511
e.registerCallback @ appservice?t=1534209702568:3511
n.forEach @ appservice?t=1534209702568:3511
d @ appservice?t=1534209702568:3511
k.onmessage @ appservice?t=1534209702568:3511

这个应该是 把 onShareAppMessage这个方法 写到 methods 里面去了吧，我开始也遇到了，要写methods外，他是和 生命周期一级的

ex:

<template>
</template>
<script>
export default {data() {return {}},methods: {},onShareAppMessage: function(options) {console.log('分享的代码！！')}
}
</script>

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