js脚本类库（lib）之字符串处理

1.字符串替换全部：

String.prototype.replaceAll = function(s1,s2) {
return this.replace(new RegExp(s1,"gm"),s2);
}

2.字符去掉两端空格：

String.prototype.trim = function() {
return this.replace(/^\s+|\s+$/g, "");
}

3.字符格式化：

String.prototype.format = function() {
var args = arguments;
var result = this.replace(/\{(\d+)\}/g, function($0, $1) {
return args[parseInt($1)];
});
return result;
}

4.格式化html字符，如：<、>等：

String.prototype.escape = function() {
return this.replace(/</g, "<").replace(/>/g, ">");
}

5.取的查询的URL字符串：

function getQueryString(name, url) {
var sReg = "[\\?\\&]({0})=([^\\&]*)";
var reg = new RegExp(sReg.format(name), "i");
if (url == null || url == "") {
url = location.search;
}
var match = url.match(reg);
if (match != null) {
var result = match[2];
return result;
}
return null;
}