简易模版实现，支持
format('{{0}} #{!1} #{!!2}', '<br/>', '<br/>', '<br/>')
=> <br/> <br/> <br/>
规则：默认会转码将 < 转换成 < ；不想转码可以用!直接输出；!!表示会自动接码
代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled 1</title>
<script type="text/javascript">
<!--
var format = function (source, opts) {
function handler(match, key) {
var type = String(key).indexOf('!!') === 0 ? 'decode' : String(key).indexOf('!') === 0 ? 'normal' : 'encode',
parts = key.replace(/^!!?/, '').split('.'),
part = parts.shift(),
cur = data,
variable;
while (part) {
if (cur[part] !== undefined) {
cur = cur[part];
}
else {
cur = undefined;
break;
}
part = parts.shift();
}
variable = cur;
if ('[object Function]' === toString.call(variable)) {
variable = variable(key);
}
if (undefined !== variable) {
variable = String(variable);
// encodeURIComponent not encode '
var fr = '&|<|>| |\'|"|\\'.split('|'),
to = '&|<|>| |'|"|\'.split('|');
if (type === 'decode') {
for (var i = fr.length - 1; i > -1; i--) {
variable = variable.replace(new RegExp('\\' + to[i], 'ig'), fr[i]);
}
}
else if (type === 'encode') {
for (var i = 0, l = fr.length; i < l; i++) {
variable = variable.replace(new RegExp('\\' + fr[i], 'ig'), to[i]);
}
}
}
return (undefined === variable ? '' : variable);
}
source = String(source);
var data = Array.prototype.slice.call(arguments, 1),
toString = Object.prototype.toString;
if (data.length) {
data = (data.length == 1 ?
/* ie 下 Object.prototype.toString.call(null) == '[object Object]' */
(opts !== null && (/\[object (Array|Object)\]/.test(toString.call(opts))) ? opts : data) : data);
return source.replace(/#\{(.+?)\}/g, handler).replace(/\{\{(.+?)\}\}/g, handler);
}
return source;
};
function doit(){
//Todo
alert(format('{{0}} #{!1} #{!!2}', '<br/>', '<br/>', '<br/>'))
}
//-->
</script>
</head>
<body><button type="button" onclick="doit()">doit</button>
</body>
</html>