前端数据缓存（一）

/**
 * cache 类定义，cache对象在main.jsp 中定义
 * @param {Object} scope
 * @memberOf {TypeName} 
 * @return {TypeName} 
 */
var BaseCache = function(scope){
	this.scope = scope;
	this.gloableCache = this._getPrmGoableCache();
	//init
	if(this.gloableCache){
		if(this.gloableCache[this.scope] == undefined){//全局cache，所以不会重新生成cache
			this.gloableCache[this.scope] = {};
		}
	}
	
}

BaseCache.prototype = {
	_getPrmGoableCache : function(){
		if(top===self){//topest window
            if(window.prmGloableCache){
            	return window.prmGloableCache;
            }
        }else{
            var p=parent;
            while(p){
                if(p.prmGloableCache|| p.top==p.self){
                    break;
                }else{
                    p=p.parent;
                }
            }
	        if(p.prmGloableCache){
	            return p.prmGloableCache;
	        }
        }
	},
	put:function(key, value){
		if(this.gloableCache && this.gloableCache[this.scope]){
			this.gloableCache[this.scope][key] = value;
		}
	},
	get:function(key){
		if(this.gloableCache && this.gloableCache[this.scope]){
			return this.gloableCache[this.scope][key];
		}
	},
	clear:function(){
		if(this.gloableCache && this.gloableCache[this.scope]){
			return this.gloableCache[this.scope] = {};
		}
	},
	clearByKey:function(key){
		if(this.gloableCache && this.gloableCache[this.scope]){
			delete this.gloableCache[this.scope][key];
		}
	}
};

var paramEchoCache = new BaseCache("paramEcho");

//保存form查询条件
	$.fn.saveQueryParam = function(){
		$(this).each(function(i){//一个页面上可能有多个form
			var forms = paramEchoCache.get(window.kk);
			if(forms == undefined){
				forms = {};
				paramEchoCache.put(window.kk,forms);
			}
			forms[$(this).attr('id')] = $(this).serializeArray();
		});
	}

//获取查询条件
	$.fn.getQueryParam = function(){
		var forms = paramEchoCache.get(window.kk);
		if(forms){
			var fields = forms[$(this).attr('id')];
			if(fields){
				return serializeJson(fields);
			}
		}
		return {};
	}