javascript - 如何获取JavaScript中字符串中的单词总数

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Regular Expression for accurate word-count using JavaScript
                            
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我试图计算一个句子中的单词总数。我在Javascript中使用了以下代码。

function countWords(){
    s = document.getElementById("inputString").value;
    s = s.replace(/(^\s*)|(\s*$)/gi,"");
    s = s.replace(/[ ]{2,}/gi," ");
    s = s.replace(/\n /,"\n");
    alert(s.split(' ').length);
}

因此，如果我提供以下输入，

"Hello world"  -> alerts 2       //fine
"Hello world<space>" -> alerts 3 // supposed to alert 2
"Hello world world" -> alerts 3  //fine

我哪里出问题了？

最佳答案

请尝试这个：

var word = "str";
function countWords(word) {
    var s = word.length;
    if (s == "") {
        alert('count is 0')
    }
    else {
        s = s.replace (/\r\n?|\n/g, ' ')
            .replace (/ {2,}/g, ' ')
            .replace (/^ /, '')
            .replace (/ $/, '');
        var q = s.split (' ');
        alert ('total count is: ' + q.length);
    }
}