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我试图操纵通过添加和插入到列表中的条目不可变的(3.6.4)光标:Immutable.js通过操纵光标插入元素
var data = Immutable.fromJS({a: {b: [0, 1, 2]}});
var cursor = Cursor.from(data, ['a', 'b'], function(newData){
data = newData;
});
cursor = cursor.push(3);
var newList = cursor.splice(1,0,11);
cursor.update(function(x){return newList;});
console.log(data.toJS().a.b); //Result [0, 11, 1, 2, 3]
为什么是它的cursor.splice没有更新'数据'?
现在,使用withMutation,splice似乎不起作用。我在日志语句旁边添加了结果。
var data = Immutable.fromJS({a: {b: [0, 1, 2]}});
var cursor = Cursor.from(data, ['a', 'b'], function(newData){
console.log("Setting Data");
data = newData;
});
cursor.withMutations(function(c){
console.log(c.toJS()); //[0, 1, 2]
c.push(3).toJS();
console.log(c.toJS()); //[0, 1, 2, 3]
var newList = c.splice(1,0,11);
console.log(newList.toJS()); //[11]
console.log(c.toJS());//[]
c.update(function(x){return newList;});
});
什么是实现这一目标的正确方法?从李拜伦github issue
https://github.com/facebook/immutable-js/issues/479 – user1573593