【 在 muser (负尽千重罪，练就不死心) 的大作中提到: 】
: 我不知道为什么双向绑定会evil....

say scope.inputX is bound to dom, then it means the value of scope.inputX
can change at any time.  essentially a "volatile" modifier in c.  such
things can break at any time, because you cannot tell what its value is
without fetching from it; if it changed while you are computing it is hard
to tell how your computation will continue.
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