js中去掉字符串的空格、回车换行

//例如下面这个json串，中间的\n表示换行

var str = "{'   retmsg':'success   ',\n'  trans_date':'   20170906'}";

console.log(str);

//"{'   retmsg':'success   ',

//'  trans_date':'   20170906'}"

//去掉空格

str = str.replace(/\ +/g,"");

console.log(str);

//"{'retmsg':'success',

//'trans_date':'20170906'}"

//去掉回车换行

str = str.replace(/[\r\n]/g,"");

console.log(str);

//"{'retmsg':'success','trans_date':'20170906'}"