var MyApp = san.defineComponent({
    template: ''
        + '<ul>'
        +   '<li s-for="item, index in items">{{item}}</li>'
        + '</ul>',
    initData: function () {
        return {
        };
    },
    attached: function() {
      san.nextTick(() => {
        this.data.set('items', ['q']);
        this.data.splice('items', [1, 0, 'a']);
      // this.data.push('items', 'a')
    	})
    }
});
var myApp = new MyApp();
myApp.attach(document.body);