//原始字符串
var string = "欢迎访问!\r\nhangge.com 做最好的开发者知识平台";
//替换所有的换行符
string = string.replace(/\r\n/g,"<br>")
string = string.replace(/\n/g,"<br>");
//替换所有的空格（中文空格、英文空格都会被替换）
string = string.replace(/\s/g," ");
//输出转换后的字符串
console.log(string);
const string1 = string.replace(/(\r\n)|(\n)/g,'<br>');·