Javascript / Backbone - 使用索引删除数组对象

Question

很抱歉，如果这是多余的，但我在这里搜索了几个Q＆amp; A，但我仍然无法弄清楚我做错了什么。我有一个数组保存为主干集合，我需要使用其索引从该数组中删除一个对象：

deleteCartItem:  function(e) {
    var itemIndex = $(e.currentTarget).attr( "data-index" );
    console.log(itemIndex)
    console.log(this.collection)
    console.log(this.collection.length)
    var newCollection = this.collection.splice(itemIndex);
    console.log(newCollection.length);

},

这是我的Backbone Collection：

[Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object]

Answer 1

splice实际修改了集合，并返回已删除的项目。请参阅此处的文档：

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice

请改为尝试：

deleteCartItem:  function(e) {
    var itemIndex = $(e.currentTarget).attr( "data-index" );
    console.log(itemIndex)
    console.log(this.collection)
    console.log(this.collection.length)
    this.collection.splice(itemIndex, 1);
    console.log(this.collection.length);

},

另请注意howMany参数。