删除字符串两侧的空格：

方法1 – trim() 函数

let text = "       Bin go!        ";
let result = text.trim();
//结果：Bin go!

方法2 – 正则表达式

let text = "       Bin go!        ";
let result = text.replace(/^\s+|\s+$/gm,'');
//结果：Bin go!

删除字符串所有的空格：

let text = "       B in     go!        ";
let result = text.replace(/\s/g, "");
//结果：Bingo!

将连续的多个空格精简到一个空格：

let text = "       B         in    go!        
Bingo!
";
let result = text.replace(/  +/g, ' ');
//结果： B in go! 
//Bingo! 

将Tab缩进，换行，多个连续空格均精简到一个空格：

let text = "       Bingo!   
Bingo!  Bingo!
     ";
let result = text.replace(/\s\s+/g, ' ');
result = result.replace(/\r?\n|\r/g,' '); // 专门去掉“换行”
//结果： Bingo! Bingo! Bingo!