//原始字符串
var string = "歡迎訪問!\r\nhangge.com    作最好的開發(fā)者知識平臺";
//替換全部的換行符
string = string.replace(/\r\n/g,"<br>")string = string.replace(/\n/g,"<br>");
//替換全部的空格（中文空格、英文空格都會被替換）
string = string.replace(/\s/g,"&nbsp;");
//輸出轉(zhuǎn)換后的字符串
console.log(string);

//原始字符串
 var string = "歡迎訪問!\r\nhangge.com    作最好的開發(fā)者知識平臺"; 
 //去掉全部的換行符
 string = string.replace(/\r\n/g,"")string = string.replace(/\n/g,""); 
 //去掉全部的空格（中文空格、英文空格都會被替換）
 string = string.replace(/\s/g,""); 
 //輸出轉(zhuǎn)換后的字符串
 console.log(string);