发布于 2016-10-30 08:34:28 | 99 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的Javascript教程,程序狗速度看过来!

JavaScript客户端脚本语言

Javascript 是一种由Netscape的LiveScript发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言,主要目的是为了解决服务器端语言,比如Perl,遗留的速度问题,为客户提供更流畅的浏览效果。


这篇文章主要介绍了Javascript实现的常用算法,如冒泡、快速、鸽巢、选择、木桶、奇偶等,需要的朋友可以参考下

l = [6, 2, 4, 1, 98, 34, 5, 9, 23, 8, 10, 32]

       
//冒泡排序
/*function bubbleSort(arr) {
    newarr = arr.slice()
    if (newarr.length <= 2) return newarr
    for (var i = 0; i < newarr.length - 1; i++) {
        for (var j = 0; j < newarr.length - i - 1; j++) {
            if (newarr[j] > newarr[j + 1]) {
                newarr[j] = [newarr[j + 1], newarr[j + 1] = newarr[j]][0]

            }
        }
    }
    return newarr
}

console.log(l)
result = bubbleSort(l)
console.log(result)*/

       
//快速排序
/*function quickSort(arr) {
    if (arr.length <= 1) return arr;
    var left = [],
        right = [],
        middle = [];
    var mid = arr[Math.floor(arr.length / 2)]
    for (var i = 0; i < arr.length; i++) {
        if (arr[i] < mid) {
            left.push(arr[i]);
        } else if (arr[i] > mid) {
            right.push(arr[i]);
        } else {
            middle.push(mid);
        }
    }
    return [].concat(quickSort(left), middle, quickSort(right))

}

var results = quickSort(l)
console.log(results)

       
*/

//选择排序
/*function selectSort(arr) {
    var min = 9999,
        minindex = 0;
    var left = [],
        right = arr.slice();
    if (arr.length <= 1) return arr;
    for (var i = 0; i < arr.length; i++) {
        if (arr[i] <= min) {
            min = arr[i];
            minindex = i;
        }
    }
    left.push(min);    
    right.splice(minindex, 1);
    return [].concat(left, selectSort(right))
}

       
var results = selectSort(l)
console.log(results)*/

       
//插入排序
/*function insertSort(arr) {
    var tmp;
    for (var i = 1; i < arr.length; i++) {
        tmp = arr[i];
        for (var j = i; j > 0; j--) {
            if (arr[j - 1] > tmp) {
                arr[j] = arr[j - 1];
            } else {
                break;
            }
        }
        arr[j] = tmp;
    }
    return arr;
}

var results = insertSort(l)
console.log(results)*/

//木桶排序
/*function bucketSort(arr){
    var bucket = [];
    var newarr = [];
    for (var i = 0; i < arr.length; i++) {
        bucket[arr[i]] = arr[i];
    }
    for (var i = 0; i < bucket.length; i++) {
        if (bucket[i] !== undefined){
            newarr.push(bucket[i])
        }
    }
    return newarr;
}

var results = bucketSort(l)
console.log(results)*/

//鸽巢排序,非负整数
/*function pigeonholeSort(arr){
    var tempArr = [];
    for(var i=0,l=arr.length;i<l;i++){
        tempArr[arr[i]] = (tempArr[arr[i]]+1)||1 ;
    }

    var result = [],count;
    for(var k=0;k<tempArr.length;k++){
        count = tempArr[k];
        if(count){
            for(var i=0;i<count;i++){
                result.push(k);
            }
        }      
    }

    return result;    
}

var results = pigeonholeSort(l)
console.log(results)*/

//归并排序
/*function mergeSort(arr) {
    if (arr.length <= 1) return arr;
    var mid = Math.floor(arr.length / 2);
    var left = MergeSort(arr.slice(0, mid));
    var right = MergeSort(arr.slice(mid));
    var result = [];

    while (left.length && right.length) {
        if (left[left.length - 1] <= right[0]) {
            result = result.concat(left);
            left = [];
        } else if (right[right.length - 1] < left[0]) {
            result = result.concat(right);
            right = [];
        } else {
            if (right[0] < left[0]) {
                result.push(right.shift());
            } else {
                result.push(left.shift());
            }
        }
    }
    result = result.concat(left, right);

    return result;
}*/

       

/*function mergeSort(arr) {
    var merge = function(left, right) {
        var result = [];
        while (left.length > 0 && right.length > 0) {
            if (left[0] < right[0]) {
                result.push(left.shift());
            } else {
                result.push(right.shift());
            }
        }
        return result.concat(left).concat(right);
    }

    if (arr.length == 1) return arr;
    var middle = Math.floor(arr.length / 2),
        left = arr.slice(0, middle),
        right = arr.slice(middle);
    return merge(mergeSort(left), mergeSort(right));
}

var results = mergeSort(l)
console.log(results)

*/

       
//堆排序

/*function heapSort(arr) {
    var findRoot = function(arr, p, length) {
        p = p || 0;
        length = length || arr.length;
        var self = arguments.callee;
        var l = p * 2 + 1;
        var r = (p + 1) * 2;
        var left, right;

        if (l < length) left = self(arr, l, length);
        if (r < length) right = self(arr, r, length);
        if (left > arr[p]) arr[p] = [left, arr[l] = arr[p]][0];
        if (right > arr[p]) arr[p] = [right, arr[r] = arr[p]][0];

        return arr[p];
    };

       
    for (var i = arr.length; i > 0; i--) {
        findRoot(arr, 0, i);
        arr[i - 1] = [arr[0], arr[0] = arr[i - 1]][0];
    }
    return arr;
}

var results = heapSort(l)
console.log(results)*/

       

//奇偶排列

/*function oddEvenSort(arr) {
    var swaped = true,
        k = 0;
    while (swaped) {
        if (k > 0) swaped = false;

        for (var i = k; i < arr.length - 1; i += 2) {
            if (arr[i]>arr[i+1]) {
                arr[i] = [ arr[i+1], arr[i+1]=arr[i] ][0];
                swaped = true;
            }
        }
        k = [1, 0][k]
    }
    return arr;
}

var results = oddEvenSort(l)
console.log(results)*/

function oddEvenSort(arr) {
    var swaped = true;
    while (swaped) {
        swaped = false;
        for (var i = 0; i < arr.length; i += 2) {
            if (arr[i] > arr[i + 1]) {
                arr[i] = [arr[i + 1], arr[i + 1] = arr[i]][0];
                swaped = true;
            }
        }
        for (var i = 1; i < arr.length; i += 2) {
            if (arr[i] > arr[i + 1]) {
                arr[i] = [arr[i + 1], arr[i + 1] = arr[i]][0];
                swaped = true;
            }
        }
    }
    return arr;
}

var results = oddEvenSort(l)
console.log(results)


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