fix: #83 修改behavior注入位置 #84
                
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如果behavior在头部注入会导致computed读不到mobx-bindings的数据。直接改成push好像也不太好,可能会覆盖其他用户自定义的behavior定义的数据?我的想法是在behaviors查找一次有没有注入mobxBehavior,但是我调试了一下发现behavior构造出来是一个字符串,所以我不知道怎么判断好,求大佬指点改进一下。
@TtTRz