Vue.js 0.12.0 RC2 发布，此版本更新内容如下：
Support staggering transitions for
Simply add a
Support expressions in content selectors. (resolved only once)
v-class can now accept an object value. The keys will be used as class names and toggled based on the truthy-ness of the value.
Warnings in debug mode now prints the error stack instead of invoking the debugger statement.
v-ref is used together with
and the value being repeated on is an Object, the corresponding ref
will also be an Object, with its keys pointing to the associated child
Transition cancel hook: you can now use
leaveCancelled hooks to handle a cancelled transition. Functions returned in
leave hooks are no longer respected.