经常忘记怎么去掉字符的空格，今天整理一下
//去掉全部空格
var str = " 546546 4564 46 46 88 88 ";
var str = str.replace(/\s+/g,"");//生成新的字符串，并未对原字符串修改
console.log(str);//结果546546456446468888
//去掉左空格
var str1 = " 546546 4564 46 46 88 88 ";
var str1 = str1.replace(/^\s*/,"");
console.log(str1);//结果546546 4564 46 46 88 88
//去掉右空格
var str2 = " 546546 4564 46 46 88 88 ";
var str2 = str2.replace(/(\s*$)/g,"");
console.log(str2);//结果 546546 4564 46 46 88 88
//去掉左右空格
var str3 = " 546546 4564 46 46 88 88 ";
var str3 = str3.replace(/^\s+|\s+$/g,"");
console.log(str3)//结果546546 4564 46 46 88 88
