What are useful JavaScript methods that extends built
What are your most useful, most practical methods that extends built-in JavaScript objects like String, Array, Date, Boolean, Math, etc.?
String
Array
Date
Note : Please post one extended method per answer.
字符串全部替换：
String.prototype.replaceAll = function(search, replace)
{
//if replace is not sent, return original string otherwise it will
//replace search string with 'undefined'.
if (replace === undefined) {
return this.toString();
}
return this.replace(new RegExp('[' + search + ']', 'g'), replace);
};
var str = 'ABCADRAE';
alert(str.replaceAll('A','X')); // output : XBCXDRXE
Here's another implementation of String.replaceAll() method
String.prototype.replaceAll = function(search, replace) {
if (replace === undefined) {
return this.toString();
}
return this.split(search).join(replace);
}
The difference between this one and solution posted here is that this implementation handles correctly regexp special characters in strings as well as allows for word matching
Array.prototype.indexOf = Array.prototype.indexOf || function (item) {
for (var i=0; i < this.length; i++) {
if(this[i] === item) return i;
}
return -1;
};
用法：
var list = ["my", "array", "contents"];
alert(list.indexOf("contents")); // outputs 2