javascript 工作常用小方法总结

/*剔除多余空格*/
String.prototype.trim = function(){
return this.replace(/\s*/g, '');
};

var str = '   ab  a b ';
str.trim();
console.log(str);    //str:"abab";

Array.prototype.compact = function () {
var t = [];
this.forEach(function (i) {
if (typeof(i) != 'undefined' && i != null)t.push(i)
});
return t;
};

var arr = ['a',null,'b',undefined,'c'];  //arr: ["a", null, "b", undefined, "c"]
arr.compact();
console.log(arr);   //  arr: ["a", "b", "c"]