Javascript拓展String方法小结_javascript技巧

String.prototype.EndWith = function (str) {
if (str == null || str == "" || this.length == 0 || str.length > this.length)
return false;
if (this.substring(this.length - str.length) == str)
return true;
else
return false;
return true;
}
String.prototype.StartWith = function (str) {
if (str == null || str == "" || this.length == 0 || str.length > this.length)
return false;
if (this.substr(0, str.length) == str)
return true;
else
return false;
return true;
}
String.prototype.Trim = function () {
return this.replace(/(^\s*)|(\s*$)/g, "");
}
String.prototype.ltrim = function () {
return this.replace(/(^\s*)/g, "");
}
String.prototype.rtrim = function () {
return this.replace(/(\s*$)/g, "");
}
String.format = function (str) {
var i = 1, args = arguments;
var str = args[0];
var re = /\{(\d+)\}/g;
return str.replace(re, function () { return args[i++] });
};
var Json2string = function (obj) {
var t = typeof (obj);
if (t != "object" || obj === null) {
// simple data type
if (t == "string") obj = "'" + obj + "'";
return String(obj);
}
else {
// recurse array or object
var n, v, json = [], arr = (obj && obj.constructor == Array);
for (n in obj) {
v = obj[n]; t = typeof (v);
if (t == "string") v = "'" + v + "'";
else if (t == "object" && v !== null)
v = Json2string(v);
json.push((arr ? "" : "'" + n + "':") + String(v));
}
return (arr ? "[" : "{") + String(json) + (arr ? "]" : "}");
}
};