javascript - 如果删除数组中固定开头的值呢？

问题描述

问 题

比如我有一个数组，我想把数组中所有开头带13的删除，为什么数组只会删除偶数呢？而且只会删除5个。

var arr = ["1302","1303","1304","1305","1306","1307","1308","1309","1310","1311"]
arr.map(function(val,index,arr){
    if (arr[index].substring(0,2) == sub) {
        arr.splice(index,1);
    }
})
console.log(arr[index],val,index);

解决方案

arr.filter(function(item){return !item.startsWith('13')})

你不能在map的时候修改arr

---

var arr = ["1302","1303","1304","1305","1306","1307","1308","1309","1310","1311"];
for(var i = 0 ; i < arr.length ; i ++){
    if(arr[i].startsWith('13'))
        arr.splice(i--,1);
}

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