Revised a js operation userdata_javascript technique on the Internet

<script> <br>//userData类 <br>var RuserData={ <br>o:null, <br>timeExpires:7, <br>browser:'', <br>//初始化userdata <br>init:function() <br>{ <br>if(this.browser != '') <br>return true; <br>if(window.ActiveXObject)//for IE { <br>try{ <br>this.o=document.createElement("input"); <br>this.o.id="Ruserdata"; <br>this.o.type="hidden"; <br>this.o.style.behavior="url(#default#userData)"; <br>this.browser='ie'; <br>document.body.appendChild(this.o); <br>return true; <br>}catch(e){return false;} <br>}else if(window.sessionStorage)//FF 2.0 */ <br>{ <br>try{ <br>this.o=window.sessionStorage; <br>this.browser='ff'; <br>return true; <br>}catch(e){return false;} <br>} <br>return false; <br>}, <br>setVal:function(key,val,timeout/*正定义超时时间,为空用默认值*/){ <br>this.init(); <br>if(this.browser == 'ie'){ <br>try{ <br>this.o.load(key); <br>this.o.expires=typeof timeout == 'undefined' ? this.getTimeLimit(this.timeExpires) : this.getTimeLimit(timeout); <br>this.o.setAttribute('value',val); <br>this.o.save(key); <br>return true; <br>}catch(e){return false} <br>}else if(this.browser == 'ff'){ <br>try{this.o.setItem(key,val);return true;} <br>catch(e){return false} <br>} <br>}, <br>getVal:function(key){ <br>this.init(); <br>if(this.browser == 'ie'){ <br>try{ <br>this.o.load(key); <br>return this.o.getAttribute('value'); <br>}catch(e){return false;} <br>}else if(this.browser == 'ff'){ <br>try{return this.o.getItem(key);} <br>catch(e){return false} <br>} <br>}, <br>delVal:function(key){ <br>this.init(); <br>if(this.browser == 'ie'){ <br>try{ <br>this.o.load(key); <br>this.o.expires=new Date(315532799000).toUTCString(); <br>this.o.save(key); <br>return true; <br>} <br>catch(e){return false;} <br>}else if(this.browser == 'ff'){ <br>try{this.o.removeItem(key);return true;} <br>catch(e){return false} <br>} <br>}, <br>getTimeLimit:function(days/*设置超时天数*/){ <br>var d=new Date(); <br>d.setDate(d.getDate() days); <br>return d.toUTCString(); <br>} <br>}; <br>window.onload=function(){ <br>//alert(RuserData.delVal('renchao')); <br>//alert(RuserData.setVal('renchao','脚本之家www.jb51.net')); <br>alert(RuserData.getVal('renchao')); <br>} <br></script>

window.onload=function(){
//alert(RuserData.delVal('renchao'));
//alert(RuserData.setVal('renchao','脚本之家www.jb51.net'));
alert(RuserData.getVal('renchao'));
}