JavaScript基本算法

1-1 filter 过滤关键字

 <script>
        /* 返回数组  
        String   match
         */
        var arr = [{city:"武汉",state:true,spell:"wuhan"},
        {city:"北京",state:false,spell:"beijing"},
        {city:"武昌",state:false,spell:"wuchang"}]
        /* city中含有武的组成一个数组 */
        var keyword = "武汉";
        var res = arr.filter(item=>{
            // return  item.city.includes(keyword);
            if(item.city.includes(keyword) || item.spell.includes(keyword) ){
                return item;
            }
        })
        console.log(res)
    </script>

1-2 数组去重

<script>
        /* 数组去重
         */
        var arr = [1,2,1,4,5,6,4];
        /* arr = [1,2,4,5,6] */
        var result = [];
        arr.forEach(item=>{
            if(!result.includes(item)){
                result.push(item);
            }
        })
        console.log(result)
 </script>

1-3 对象中键的数组过滤

 var obj ={
            A:[{name:"html"},{name:"ctc"}],
            B:[{name:"vue"},{name:"js"}],
            C:[{name:"vue"},{name:"js"}]
        }
        var keyword ="c";
        /* arr */
        var arr = Object.values(obj);
        var res = [];
        arr.forEach(item=>{
            res.push(...item)
        })
        console.log(res)