Question

我正在寻找一种从字符串中提取单词数量的方法。

例如，我有以下字符串。

var word = "Customer Courseware Development and OTB Creation - Learning Center Set Up"

var value = 4;

根据上面的值，我想得到字符串中的最后4个单词，即＆＃34;学习中心设置＆＃34;

到目前为止，我所做的就是在下面我只得到了＃34; Up＆＃34;字。

var wordlength = 4;

var str = "Customer Courseware Development and OTB Creation - Learning Center Set Up"

var parts = str.substring(str.lastIndexOf(" ") - length);

console.log(parts);

Answer 1

您可以将Array#slice()与join()

一起使用

＆＃13;

var wordlength = 4;
var str = "Customer Courseware Development and OTB Creation - Learning Center Set Up";
var parts = str.split(' ');
var newString = parts.slice(parts.length-wordlength, parts.length).join(" ");

console.log(newString);

＆＃13;

Answer 2

你可以这样做。使用' '拆分句子，然后从parts.length - wordlength开始切片。

var wordlength = 4;
var str = "Customer Courseware Development and OTB Creation - Learning Center Set Up"
var parts = str.split(' ');

var newStr = parts.slice(parts.length-wordlength, parts.length).join(' ');

console.log(newStr);

Answer 3

使用：

var word = "Customer Courseware Development and OTB Creation - Learning Center Set Up"
var wordlength = 4

var words = word.split(" ") 
var result = words.slice(words.length - wordlength)

输出：

Array [ "Learning", "Center", "Set", "Up" ]

然后从上面的数组中创建一个字符串：

result.join(" ")

结果：

"Learning Center Set Up"

如何根据值提取单词的最后部分

3 个答案: