js使用在指定数据前面或后面插入数据,对List数据排序

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>列表</title>
</head>
<body>

</body>


<script>
    function List() {
        this.dataStore = [];

        this.append1 = function (data) {
            //获得数组的长度
            var length = this.length();
            if(length==0) {
                this.dataStore[0] = data;
            }
            else {
                for(var i=length-1;i>=0;i--) {
                    if(this.dataStore[i]<data) {
                        this.insert(data,this.dataStore[i]);
                        return;
                    }
                }
                this.insertBefore(data,this.dataStore[0]);
            }

        }

        this.length = function () {
            //获得数组的长度
            var length = this.dataStore.length;
            return length;
        }

        //如果找到当前的数据,就返回当前数据的下标,如果没有找到数据就返回-1
        this.find = function (data) {
            //1,获得数组的长度
            var length = this.length();
            //2,设置返回数据的下标
            var index = -1;
            //3,遍历数据
            for (var i = 0; i < length; i++) {
                if (data == this.dataStore[i]) {
                    index = i;
                    return index;
                }
            }
            return index;
        }

        this.forEach = function (call) {
            //1,获得数组的长度
            var length = this.length();
            //2,遍历数据
            for (var i = 0; i < length; i++) {
                call(this.dataStore[i]);
            }
        }

        //在after后面插入数据,如果after有数据,就插入在after后面,如果after没有数据,就把data插入到最后面的数据
        this.insert = function (data, after) {
            //1,找到当前after数据的下标
            var index = this.find(after);
            if (index == -1) {
                //向队列后面添加数据
                this.append(data);
            } else {
                //  1,2,3,4,5,5,7,9
                var length = this.length();
                for (var i = length - 1; i > index; i--) {
                    this.dataStore[i + 1] = this.dataStore[i]
                }
                this.dataStore[index + 1] = data;
            }
        }

        //在before前面插入数据,如果before有数据,就插入在before前面,如果before没有数据,就把data插入到最前面的数据
        this.insertBefore = function (data,before) {
            //1,找到当前before数据的下标
            var index = this.find(before);
            var length = this.length();
            if(index==-1) {
                for (var i = length - 1; i >= 0; i--) {
                    this.dataStore[i + 1] = this.dataStore[i]
                }
                this.dataStore[0] = data;
            }
            else {
                for (var i = length - 1; i >= index; i--) {
                    this.dataStore[i + 1] = this.dataStore[i]
                }
                this.dataStore[index] = data;
            }
        }
    }

    var list = new List();
    list.append1(1);
    list.append1(2);
    list.append1(0);
    list.append1(10);
    list.append1(9);

    list.forEach(function (data) {
        console.log(data);
    });


</script>
</html>

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转载自blog.csdn.net/qq_34607371/article/details/81085779
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