javascript - vuejs 用v-for不出来东西，换成v-repeat就好了，求解？

版本 Vue.js v0.12.16
报如下错误： [Vue warn]: Failed to resolve directive: for

把 v-for="book in books" 换成 v-repeat="book:books" 就是好的。
Html:

            

                

                    
{{book.id}}
                    
{{book.name}}
                    
{{book.author}}
                    
{{book.price}}
                
            

Js:

var datas = {
    book: {
        id: 0,
        name: '',
        author: '',
        price: ''
    },
    books: [{
        id: 1,
        author: '曹雪芹',
        name: '红楼梦',
        price: 32.0
    }, {
        id: 2,
        author: '施耐庵',
        name: '水浒传',
        price: 30.0
    }]
}
var vm = new Vue ({
    el: '#bookapp',
    data: datas
})