javascript - 如何使用javascript从数组中删除元素

Question

我有 2 个数组，想要根据第一个数组上的位置编号删除第二个数组的元素。

var notexists = []; //value is "1","5","8" on 0,1,2nd position. 
var copyrequiredfields = [];//Value is "a","b","c","d","e","f",...
for (var i = 0; i < notexists.length; i++) {
     copyrequiredfields.splice(parseInt(notexists[i]), 1);
}

按照示例，我想从 copyrequiredfields 中删除第 1 个、第 5 个和第 8 个元素。请提出一些答案。

Answer 1

创建一个新数组，迭代copyrequiredfields，当note中的索引存在时，忽略它。

示例:

var notexist = [1,2,5];
var copyrequiredfields = ['a','b','c','d','e','f','g'];
//create a index map
var index_map = {};
for(var i = 0; i < notexist.length; i++){
    index_map[notexist[i]] = true;
}
//remove the elements
var newarray = [];
for(var i = 0; i < copyrequiredfields.length; i++){
    if(!index_map[i]){
        newarray.push(copyrequiredfields[i]);
    }
}
copyrequiredfields = newarray;