我已经编写好了这样一串代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<script type="text/javascript">
var pgCt = window.localStorage.getItem("pageCount");
/*在sessionStorage中定义数据*/
window.sessionStorage.setItem("myFirstKeyInSessionStorage","valueA");
window.sessionStorage.setItem("peter","dog");
window.sessionStorage.setItem("bill","boy");
window.sessionStorage.setItem("lily","girl");
/*在localStorage中定义数据*/
window.localStorage.setItem("myFirstKeyInLocalStorage","valueA");
window.localStorage.setItem("hitler","a bad guy");
window.localStorage.setItem("washington","a good guy");
window.localStorage.setItem("bob","a friend");
/*检测浏览器是否支持Web Storage*/
function checkStorageSupport(){
if(window.sessionStorage){
alert("浏览器支持window.sessionStorage");
}else{
alert("浏览器不支持window.sessionStorage");
}
if(window.localStorage){
alert("浏览器支持window.localStorage");
}else{
alert("浏览器不支持window.localStorage");
}
if(!window.sessionStorage||window.localStorage){
alert("看来这个网页你没法使用了！换个浏览器吧！\n比如chrome");
}
return 0;
}
/*其它钩子函数*/
function findItemSessionStorage(){
var key=prompt("请输入数据项","");
var value=window.sessionStorage.getItem(key);
alert(key+"的值为"+value);
return 0;
}
function findItemLocalStorage(){
var key=prompt("请输入数据项","");
var value=window.localStorage.getItem(key);
alert(key+"的值为"+value);
return 0;
}
function setItemSessionStorage(){
var key=prompt("请输入要添加或设置的数据项","");
var value=prompt("请输入"+key+"的值","");
window.sessionStorage.setItem(key,value);
alert("操作成功");
return 0;
}
function setItemLocalStorage(){
var key=prompt("请输入要添加或设置的数据项","");
var value=prompt("请输入"+key+"的值","");
window.localStorage.setItem(key,value);
alert("操作成功");
return 0;
}
/*该区块不可用*/
function removeItemSessionStorage(){
var key=prompt("请输入要移除的数据项","");
eval("window.sessionStorage.removeItem("+key+");");
alert("成功移除"+key);
return 0;
}
function removeItemLocalStorage(){
var key=prompt("请输入要移除的数据项","");
eval("window.localStorage.removeItem("+key+");");
alert("成功移除"+key);
return 0;
}
function getLoc(){
var a=window.location.toString()
alert(a);
}
function onload(){
if(pgCt!=null&&pgCt!=undefined){
pgCt++;
}else{
pgCt=1;
}
window.localStorage.pageCount=pgCt;
var obj = document.getElementById("lb1");
obj.innerHTML=pgCt;
}
</script>
<title>数据库</title>
</head>
<body onload="onload();">
<font id="Sz" size="+0">
<form name="test">
<p>测试</p>
<button name="storageSupportChecker" onclick="checkStorageSupport()">测试是否存在sessionStorage和localStorage</button>
</form>
<form name="getItems">
<p>获取数据</p>
<button name="getItemSS" onclick="findItemSessionStorage()">在sessionStorage中获取数据</button>
<button name="getItemLS" onclick="findItemLocalStorage()">在localStorage中获取数据</button>
</form>
<form name="setItems">
<p>设置数据和添加数据</p>
<button name="setItemSS" onclick="setItemSessionStorage()">在sessionStorage中设置和添加数据</button>
<button name="setItemLS" onclick="setItemLocalStorage()">在localStorage中设置和添加数据</button>
</form>
<!--以下控件正在开发-->
<form name="removeItems">
<p>移除数据</p>
<button name="removeItemSS" onclick="removeItemSessionStorage()">在sessionStorage中移除数据</button>
<button name="removeItemLS" onclick="removeItemLocalStorage()">在localStorage中移除数据</button>
</form>
<form name="other">
<p>杂项</p>
<button name="getLocation" onclick="getLoc()">查看该网页链接</button>
</form>
<form name="testform">
访问次数：<label id="lb1"/>
</form>
</font>
</body>
</html>
显示的页面是这样的：
但是为什么removeItem函数在网页中用不了
但是在chrome的控制台中执行window.sessionStorage.removeItem(key)或window.localStorage.removeItem(key)却可以
