JS基础回顾，小练习（去除字符串空格）

var str = ‘ h t m l 5 ‘;
function trim(str) {
    var reg = /(\s+)/g;
    var m,s = str;
    while(m = reg.exec(s)){
        s = s.replace(m[1],"");
    }
    return s;
}

str = trim(str);
console.log(str); //html5

var str = ‘  h    t m l   5  c s  s 3‘;
function trim(str){
    for(var i=0,s = str;i<str.length;i++){
        s = s.replace(" ","");
    }
    return s;
}
console.log(trim(str)); //html5css3

var str = ‘  h    t m l   5  c s  s 3‘;
function trim(str){
    var s = ‘‘;
    var reg = /[^\s]/g;
    var m;
    while(m = reg.exec(str)){
        s += m;
    }
    return s;
}
console.log(trim(str)); //html5css3