javascript - 即使迭代键，从数组对象中删除值也会修改整个对象

Question

对数组对象执行操作:
- - -代码 - - - -

 var obj1 = { 'a': ['a','b','c','d'], 'b':['b','d','r','a']}
    Object.keys(obj1).forEach(element => {
        var range = obj1[element].indexOf(element);
        if (range !== -1) {
            obj1[element].splice(range, 1);
        }});
    
    Result: {
        "a": [  "c",  "d" ],
        "b": [ "d","r"]
    }

Answer 1

您可以搜索索引并删除不需要的键。

var object = {
  a: ['a', 'b', 'c', 'd'],
  b: ['b', 'd', 'r', 'a']
};

Object.keys(object).forEach((key, _, keys) => {
    var index;
    while ((index = object[key].indexOf(key)) !== -1)
        object[key].splice(index, 1);
});

console.log(object);