js去掉字符串中多余的空格

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我是靠谱客的博主醉熏绿茶，最近开发中收集的这篇文章主要介绍js去掉字符串中多余的空格，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

例如：

字符串：" the quick brown for jumped over the lazy dog "

效果图：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        var sentence="   the     quick brown  for jumped over the lazy dog   ";

        //获得当前字符串的长度
        var length = sentence.length;

            //去掉字符串前面的空格
        for(var i=0;i<length;i++) {
            if(sentence[i]!=' ') {
                sentence = sentence.substring(i,length);
                break;
            }
        }

        //去掉字符串前面空格的字符串长度
        length=sentence.length;
        //去掉字符串后面的空格
        for(var i=length-1;i>=0;i--) {
            if(sentence[i]!=' ') {
                sentence = sentence.substring(0,i+1);
                break;
            }
        }

        length=sentence.length;
        //去掉字符串中间的空格
        for(var i=0;i<length;i++) {
            if(sentence[i]==' ') {
                if(sentence[i+1]==' ') {
                    var buffer1 = sentence.substring(0,i);
                    var buffer2 = sentence.substring(i+1,sentence.length);
                    sentence = buffer1+buffer2;
                    i--;
                }
            }
        }

        console.log(sentence);
    </script>
</head>
<body>

</body>
</html>