用cookie实现localstorage功能

<script  type="text/javascript">

//创建localStorage1
var localStorage1Class = function(){
        this.options = {
        expires : 60*24*3600,
    }
}
localStorage1Class.prototype = {
    //初实化。添加过期时间
       init:function(){
        var date = new Date();
        date.setTime(date.getTime() + 60*24*3600);
        this.setItem(‘expires‘,date.toGMTString());
       },
    //内部函数参数说明(key) 检查key是否存在
       findItem:function(key){
        var bool = document.cookie.indexOf(key);
        if( bool < 0 ){
            return true;
        }else{
            return false;
        }
       },
       //得到元素值 获取元素值 若不存在则返回 null
       getItem:function(key){       
        var i = this.findItem(key);
        if(!i){
            var array = document.cookie.split(‘;‘)           
            for(var j=0;j<array.length;j++){
                var arraySplit = array[j];
                if(arraySplit.indexOf(key) > -1){
                     var getValue = array[j].split(‘=‘);
                    //将 getValue[0] trim删除两端空格
                     getValue[0] = getValue[0].replace(/^\s\s*/, ‘‘).replace(/\s\s*$/, ‘‘)
                    if(getValue[0]==key){
                    return getValue[1];
                    }else{
                    return ‘null‘;
                    }
                }
            }
        }
       },
       //重新设置元素
       setItem:function(key,value){
           var i = this.findItem(key)
        document.cookie=key+‘=‘+value;
       },
       //清除所有cookie 参数
       remove:function(){
    var array = document.cookie.split(‘;‘)            
           for(var cl =0 ;cl<array.length;cl++){
            var date = new Date();
            date.setTime(date.getTime() - 100);
            document.cookie =array[cl] +"=a; expires=" + date.toGMTString();
        }
       }
}          
    var localStorage1 = new localStorage1Class();
    localStorage1.init();
</script>