let http = 'http://www.baidu.com/com/img/1.jpg';

 let https = 'http:\\www.baidu.com\\com\\img\\1.jpg';

 // 转换为反斜杆

 function backSlash(url) {

     return url = url.replace(/\/\//g, "\\\\").replace(/\//g, "\\");

 }

 // 转换为正斜杆 - 待优化

 function positiveSlanting(url) {

     return url = url.replace(/\\\\?/, "\/\/").replace(/\\/g, '/');

 }

 console.log(backSlash(http), positiveSlanting(https));