Question

来自以下代码

var words = 'one two three four one two three';
wordArray = words.split(' ');
var newArray = [];
var words = {};

$.each(wordArray, function (ix, word ) {
    if ($.inArray(word , newArray) > -1) {
        words[word]++;
    }
    else {
        console.log('that wasnt in the array');
        words[word] = 1;
    }

});

如何获得按字数排序的字频率的降序输出？感谢

Answer 1

var wordsString = 'one two three four one two three';
var wordArray = words.split(' ');
var wordCounter = {};


for(var i=0; i<wordArray.length; i++){
    if(wordCounter[wordArray[i]]){
        wordCounter[wordArray[i]] += 1;
    }else{
        wordCounter[wordArray[i]] = 1;
    }
}

此时我们有每个＆＃34; word＆＃34;的总数，但没有排序。要添加排序，我们只需使用Array.sort()函数

对wordArray进行排序

var wordArraySortFunction = function(word1, word2){
    if(wordCounter[word1] < wordCounter[word2]){
        return -1;
    }else if(wordCounter[word1] == wordCounter[word2]){
        return 0;
    }else if(wordCounter[word1] > wordCounter[word2]){
        return 1;
    }
}

wordArray.sort(wordArraySortFunction);

如果要反转排序顺序，可以重写排序功能：

var wordArraySortFunction = function(word1, word2){
    if(wordCounter[word1] < wordCounter[word2]){
        return 1;
    }else if(wordCounter[word1] == wordCounter[word2]){
        return 0;
    }else if(wordCounter[word1] > wordCounter[word2]){
        return -1;
    }
}

或者你可以在排序数组上使用Array.reverse()：

wordArray.reverse();

现在我们根据频率对单词进行排序，我们可以输出它们：

for(var i=0; i<wordArray.length; i++){
    console.log(wordArray[i] + ': ' + wordCounter[wordArray[i]]);   
}

Answer 2

var wordsString = 'one two three four one two three';
var wordArray = words.split(' ');
var words = {};

$.each(wordArray, function (i, word ) {
    if (word in words) {
        words[word] += 1 ;
    }
    else {
        console.log('that wasnt in the array');
        words[word] = 1;
    }

});

字频率计数器

2 个答案: