在使用vue2.0 的时候自己没有注意到的一个问题，就对html和body作了限制
el = el && query(el);
/* istanbul ignore if */
if (el === document.body || el === document.documentElement) {
"development" !== 'production' && warn(
"Do not mount Vue to or - mount to normal elements instead."
);
return this
}
所以只能在body内使用
The provided element merely serves as a mounting point. Unlike in Vue 1.x, the mounted >element will be replaced with Vue-generated DOM in all cases. It is therefore not >recommended to mount the root instance to or .
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