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var obj = new Object();

obj.triggerOnce = function(fn) { //控制让函数只触发一次
    return function() {
        try {
            fn.apply(this, arguments);
        }
        catch (e) {
            var txt = "There was an error on this page.\n\n";
            txt += "Error message: " + e.message + "\n\n";
            txt += "Error name: " + e.name + "\n\n";
            //alert(txt);//正式平台上可能需要注释掉该行
        }
        finally {
            fn = null;
        }
    }
}