数组去重

Posted 2021-02-07 luwanying

 

1、数组去重

uniq(array){
    let temp = []; //一个新的临时数组
    for(let i = 0; i < array.length; i++){
        if(temp.indexOf(array[i]) == -1){
            temp.push(array[i]);
        }
    }
    return temp;
 }

 

 

2、数组嵌套对象去重

var songs = [
　{name:"羽根",artist:"air"}, 
　{name:"羽根",artist:"air"}, 
　{name:"晴天",artist:"周杰伦"}, 
　{name:"晴天",artist:"周杰伦"}, 
　{artist:"周杰伦",name:"晴天"} 
];

unique(songs){ 
    let result = {}; 
    let finalResult=[]; 
    for(let i=0;i<songs.length;i++){ 
     result[songs[i].name]=songs[i];//因为songs[i].name不能重复,达到去重效果,且这里必须知晓"name"或是其他键名
 } 
 //console.log(result);{"羽根":{name:"羽根",artist:"air"},"晴天":{name:"晴天",artist:"周杰伦"}} //现在result内部都是不重复的对象了，只需要将其键值取出来转为数组即可
 for(item in result){ 
   finalResult.push(result[item]); 
 } 
//console.log(finalResult);[{name:"羽根",artist:"air"},{name:"晴天",artist:"周杰伦"}]
 return finalResult; 
} 
console.log(unique(songs));