简单实用的js调试logger组件实现代码

/*
js调试组件
*/
(function () {
var logger = function (level, object, viewType) {
this.level = level;
this.object = object;
this.viewType = viewType;
}
logger.LEVEL_DEBUG = 0;
logger.LEVEL_INFO = 1;
logger.LEVEL_WARN = 2;
logger.LEVEL_ERROR = 3;
logger.LEVEL_FATAL = 4;
logger.VIEW_TYPE_ALERT = 0;
logger.VIEW_TYPE_APPEND = 1;
logger.prototype = {
setLevel: function (level) {
this.level = level;
},
setObject: function (o) {
if (typeof o == 'string') {
this.object = document.getElementById(o);
} else {
this.object = o;
}
},
setViewType: function (type) {
this.viewType = type;
},
log: function (s) {
this.message(100, s);
},
debug: function (s) {
this.message(logger.LEVEL_DEBUG, s);
},
info: function (s) {
this.message(logger.LEVEL_INFO, s);
},
warn: function (s) {
this.message(logger.LEVEL_WARN, s);
},
error: function (s) {
this.message(logger.LEVEL_ERROR, s);
},
fatal: function (s) {
this.message(logger.LEVEL_FATAL, s);
},
message: function (level, s) {
if (level >= this.level) {
if (this.object != null) {
this.object.innerHTML = s;
} else if (this.viewType == logger.VIEW_TYPE_ALERT) {
alert(s);
} else {
document.body.appendChild(document.createTextNode(s));
document.body.appendChild(document.createElement("br"));
}
}
}
};
if (typeof window.Logger == 'undefined' || window.Logger == null)
window.Logger = new logger(logger.LEVEL_DEBUG, null, logger.VIEW_TYPE_APPEND);
})();

Logger.debug(new Date());
Logger.debug(new Date().addHours(3));