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在设置left-arrow的同时绑定go-back事件会设用2次wx.navigateBack #3591

@dlxbcn

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@dlxbcn

this.triggerEvent('go-back');

<t-navbar title="发布" left-arrow bind:go-back="handleBack" />
我本意是点击后退按钮,调用自定义的handleBack,我的代码里调用了一次wx.navigateBack,控件本身的goback里又调用了一次。如果使用者绑定了自定义函数,就不应该再调用控件本身的处理函数。

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