摘要：数据管理平台在当今社会中运用十分广泛，我们在应用过程中，要对数据进行存储，管理，以及删除查询等操作，而我们在实际设计的时候，大牛们大多用到的是JQuery，而小白对jq理解也较困难，为了让大家回顾一下原生js，也为了让初学者对js熟练掌握，我们利用js进行设计，里面涉及到函数，事件，对象，已经存储，代码如下
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
.tr:hover {
background-color: #ccc;
}
</style>
</head>
<body>
别名(key):<input type="" name="" id="name" value="" /><br /> 网站名：
<input type="" id="Webname" /><br /> 网址：
<input type="" id="Web" /><br />
<input type="button" name="" id="" value="点击提交信息" onclick="func1()" />
<br />
<h4>网站登录</h4> 网站名：
<input type="" id="loginName" /><br /> 网址： 网址 <input type="" id="loginPwd" /><br />
<button onclick="login()">登录</button>
<h1>已经储存的网站</h1>
<input type="button" value="删除网站" onclick="delSite()" /><br />
<input type="text" placeholder="别名" id="search1" />
<input type="text" placeholder="网站名" id="search2" />
<input type="text" placeholder="网址" id="search3" />
<input type="button" name="" id="" value="查询网站" onclick="searchSite()" />
<table style="width: 500px;border-collapse: collapse;" border="1" id="table">
<thead>
<tr>
<th>
<input type="checkbox" id="checkAll" onclick="checkAll()" />
</th>
<th>序号</th>
<th>别名</th>
<th>网站名</th>
<th>网站</th>
</tr>
</thead>
<tbody id="tbody"></tbody>
</table>
<!--<div style="width: 100vw;height: 100vh;background-color: blue;position: absolute; top: 0px;left: 0px;">
<div id="" style="width: 300px;height: 200px;background-color: red;">
</div>
</div>
-->
别名(key):<input type="" name="" id="name1" value="" /><br /> 网站名：
<input type="" id="Webname1" /><br /> 网址：
<input type="" id="Web1" /><br />
<input type="button" name="" id="" value="修改确定" onclick="dateSites1()" />
<script type="text/javascript" src="js/菜鸟教程.js">
</script>
</body>
</html>
//注册
function func1() {
var name = document.getElementById("name").value;
var Webname = document.getElementById("Webname").value;
var Web = document.getElementById("Web").value;
var site = {
name: name,
Webname: Webname,
Web: Web
}
if(localStorage.sites == undefined) {
var arr = [];
} else {
var str = localStorage.sites;
var arr = JSON.parse(str);
}
for(var i = 0; i < arr.length; i++) {
if(arr[i].name == name) {
alert("姓名已经注册");
return;
}
}
arr.push(site);
var str = JSON.stringify(arr);
localStorage.sites = str;
alert("储存完毕");
showAllSite();
}
//展示
function showAllSite() {
if(localStorage.sites == undefined) {
return;
}
var str = localStorage.sites;
var arr = JSON.parse(str);
var html = "";
arr.forEach(function(item, index) {
html += "<tr class='tr' onclick='chooseInput(" + index + ")' ondblclick='dateSites(" + index + ")'><td><input type='checkbox' value='" + index + "' class='checkbox'/></td><td>" + (index + 1) + "</td><td>" + item.name + "</td><td>" + item.Webname + "</td><td>" + item.Web + "</td></tr>";
});
var tbody = document.getElementById("tbody");
tbody.innerHTML = html;
}
//进来刷新
window.onload = function() {
showAllSite();
}
//登录
function login() {
var loginName = document.getElementById("loginName").value;
var loginPwd = document.getElementById("loginPwd").value;
var str = localStorage.sites ? localStorage.sites : "[]";
var arr = JSON.parse(str);
for(var i = 0; i < arr.length; i++) {
if(arr[i].Webname == loginName && arr[i].Web == loginPwd) {
alert("登录成功！");
var loginUser = JSON.stringify(arr[i]);
sessionStorage.loginUser = loginUser;
location = "跳转.html";
return;
}
}
alert("登录失败！！！");
}
/*window.onload = function(){
var div1 = document.getElementById("div11");
div1.onmousedown = function(ev){
var oevent = ev || event;
var distanceX = oevent.clientX - div1.offsetLeft;
var distanceY = oevent.clientY - div1.offsetTop;
document.onmousemove = function(ev){
var oevent = ev || event;
div1.style.left = oevent.clientX - distanceX + 'px';
div1.style.top = oevent.clientY - distanceY + 'px';
};
document.onmouseup = function(){
document.onmousemove = null;
document.onmouseup = null;
};
}
};*/
/*单击tr选中tr里面的input*/
function chooseInput(index) {
var checkboxs = document.getElementsByClassName("checkbox")[index];
if(checkboxs.checked) {
checkboxs.checked = false;
} else {
checkboxs.checked = true;
}
}
//点击全选的input
function checkAll() {
var thisInput = document.getElementById("checkAll");
var checkboxs = document.getElementsByClassName("checkbox");
for(var i = 0; i < checkboxs.length; i++) {
if(thisInput.checked) {
checkboxs[i].checked = true;
} else {
checkboxs[i].checked = false;
}
}
}
/*删除*/
function delSite() {
var checkboxs = document.getElementsByClassName("checkbox");
var count = 0;
var str = localStorage.sites;
var arr = JSON.parse(str);
for(var i = 0; i < checkboxs.length; i++) {
if(checkboxs[i].checked) {
var index = parseInt(checkboxs[i].value) - count;
arr.splice(index, 1);
count++;
}
}
localStorage.sites = JSON.stringify(arr);
if(count == 0) {
alert("请至少选择一项");
} else {
alert("删除成功，删除了" + count + "项");
showAllSite();
}
}
/*
* 查询网站
*/
function searchSite() {
var name = document.getElementById("search1").value;
var Webname = document.getElementById("search2").value;
var Web = document.getElementById("search3").value;
var str = localStorage.sites;
var arr = JSON.parse(str);
var newArr = []; //用于装载，符合条件的数据
for(var i = 0; i < arr.length; i++) {
var isWzm = true,
isBm = true,
isWz = true;
if(arr[i].name.indexOf(name) == -1 && name != "") {
isWzm = false;
}
if(arr[i].Webname.indexOf(Webname) == -1 && Webname != "") {
isBm = false;
}
if(arr[i].Web != Web && Web != "") {
isWz = false;
}
if(isWzm && isBm && isWz) {
arr[i].index = i; // 把查询出的数据，在localStorage里面的下标，暂存到新数组的每个对象的index属性上
newArr.push(arr[i]);
}
}
var html = "";
console.log(newArr);
newArr.forEach(function(item, index) {
html += "<tr class='tr' onclick='chooseInput(" + index + ")'><td align='center'><input type='checkbox' value='" + item.index + "' class='checkbox' /></td><td>" + (index + 1) + "</td><td>" + item.name + "</td><td>" + item.Webname + "</td><td>" + item.Web + "</td></tr>";
});
var tbody = document.getElementById("tbody");
tbody.innerHTML = html;
}
//修改网站
var updateIndex = 0;
function dateSites(index) {
alert(index);
var str = localStorage.sites;
var arr = JSON.parse(str);
document.getElementById("name1").value = arr[index].name;
document.getElementById("Webname1").value = arr[index].Webname;
document.getElementById("Web1").value = arr[index].Web;
updateIndex = index;
}
function dateSites1() {
var str = localStorage.sites;
var arr = JSON.parse(str);
var name = document.getElementById("name1").value;
var Webname = document.getElementById("Webname1").value;
var Web = document.getElementById("Web1").value;
for(var i = 0; i < arr.length; i++) {
if(arr[i].name == name) {
alert("网站名已经注册，请更换网站名");
return;
}
}
var site = {
name: name,
Webname: Webname,
Web: Web,
};
arr.splice(updateIndex, 1, site);
localStorage.sites = JSON.stringify(arr);
showAllSite();
}
代码较长，对于各部分，已经用注释给分开，而css对于功能影响不大，因此我们没有对css进行设置。弄清楚这段代码，初学者会有很大进步。