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自定义组件报错，
VM79506:2 webviewScriptError
Cannot read property 'replace' of undefined;[Exparser] [Error] [Component] Lifetime Method Error @ wx-cover-view#attached
TypeError: Cannot read property 'replace' of undefined
at o.attached (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:8:5912)
at r.safeCallback (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:5:27178)
at r.call (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:5:26942)
at t (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:6:7737)
at t (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:6:8050)
at t (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:6:7992)
at t (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:6:8050)
at t (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:6:8050)
at t (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:6:8050)
at t (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:6:8050)
(anonymous) @ VM79506:2
VM79507:2 [Exparser] [Error] [Component] Lifetime Method Error @ wx-cover-view#attached
(anonymous) @ VM79507:2
VM79508:2 TypeError: Cannot read property 'replace' of undefined
at o.attached (:64847/__pageframe__/__dev__/WAWebview.js:8)
at r.safeCallback (:64847/__pageframe__/__dev__/WAWebview.js:5)
at r.call (:64847/__pageframe__/__dev__/WAWebview.js:5)
at t (:64847/__pageframe__/__dev__/WAWebview.js:6)
at t (:64847/__pageframe__/__dev__/WAWebview.js:6)
at t (:64847/__pageframe__/__dev__/WAWebview.js:6)
at t (:64847/__pageframe__/__dev__/WAWebview.js:6)
at t (:64847/__pageframe__/__dev__/WAWebview.js:6)
at t (:64847/__pageframe__/__dev__/WAWebview.js:6)
at t (:64847/__pageframe__/__dev__/WAWebview.js:6)
(anonymous) @ VM79508:2
组件如下：
js：
Component({
properties: {
top: {
type: Number,
value: 0
},
left: {
type: Number,
va
-
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