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jsÊý×éÅÄƽ

 var arr=[1,[[[7,2],8,9],3]];
    function f(arr) {
        if (Object.prototype.toString.call(arr) != "[object Array]")
            return;
        var newArr = [];
        var j=0;
    function fn(arr){
        for (var i = 0; i < arr.length; i++) {//±éÀúÊý×é
            if(arr[i].length && (j<=3)){//ÅжÏÊDz»ÊǶàάÊý×é.jµÄÉèÖÿÉÒÔÑ¡Ôñ´Ó×óÍùÓÒÅļ¸´Î，È¥µô¼´¿ÉÍêÈ«´òƽ
                j+=1;
                fn(arr[i]);    //µÝ¹éµ÷ÓÃ
            }else{
                newArr.push(arr[i]);
            }
        }
    }
    fn(arr);
    return newArr;
}
arr=f(arr);
console.log(arr);

תÔØÓÚ:https://www.cnblogs.com/zywaf/p/7169528.html