javascript string对象格式化,下面是参考代码：

/**

* 字符串格式化，类似于java中的MessageFormat.format() 函数

* e.g.

* 'This is a {0} not a {1}.'.format('string', 'num') => This is a string not a num.

* 'This is a {0}, not a {1}. so parse to {2} first.'.format('string', 'num', 'num') => This is a string not a num. so parse to num first.

* 'This is a {0}, not a {1}. so parse to {1} first.'.format('string', 'num') => This is a string not a num. so parse to num first.

* 'This is a {0}, not a {1}. so parse to {2} first.'.format('string', 'num') => This is a string not a num. so parse to {2} first.

*/

String.prototype.format = function() {

var args = arguments;

return this.replace(/\{(\d+)\}/g, function(){

var val = args[arguments[1]];

alert(val + ' ' + arguments[0]);

return (! val) ? arguments[0] : val;

});

};

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