数组去重

Posted 2020-10-01 盖大楼

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<!DOCTYPE html>
<html>

    <head>
        <meta charset="UTF-8">
        <title></title>
        <script src="http://cdn.static.runoob.com/libs/jquery/1.10.2/jquery.min.js 

">
</script>
    </head>

    <body>
        <input type="text" />
        <button>点击添加数据</button>
    </body>

</html>
<script>
    Array.prototype.unique3 = function(){
         var res = [];
         var obj = {};
         for(var i = 0; i < this.length; i++){
          if(!obj[this[i]]){
           res.push(this[i]);
           obj[this[i]] = 1;
          }
         }
         return res;
    }

    
    var arr = [];
    $(‘button‘).click(function() {
        var val = $(‘input‘).val();
        arr.push(val);
        var result=arr.unique3();
        console.log(result);
    })
</script>

小石头写的添加重复还要有弹窗提醒：

<!DOCTYPE html>
<html>

    <head>
        <meta charset="UTF-8">
        <title></title>
        <script src="http://cdn.static.runoob.com/libs/jquery/1.10.2/jquery.min.js 

">
        </script>
    </head>

    <body>
        <input type="text" class="inputtext" />
        <button>点击添加数据</button>
    </body>

</html>
<script>
    Array.prototype.unique3 = function() {
        var res = [];
        var obj = {};
        for(var i = 0; i < this.length; i++) {
            if(!obj[this[i]]) {
                res.push(this[i]);
                obj[this[i]] = 1;
            }
        }
        return res;
    }

    var arr = [];
    var result = [];
    $(‘button‘).click(function() {
        var val = $(‘input‘).val();
        if(val.length!=0){
            for(var i = 0; i < result.length; i++) {
                if(val == result[i]) {
                    alert(‘重复了‘);
                }
            };
            arr.push(val);
            result = arr.unique3();
            console.log(result);
        }
    })
</script>

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