我需要Chrome扩展程序的帮助，我似乎无能为力。我能提供的大部分资源都没有太大帮助。我需要在这里编辑什么？
这是代码： HTML
<!DOCTYPE html>
<html>
<head>
<title>WebApp</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<link rel="stylesheet" href="main.css">
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<link href='https://fonts.googleapis.com/css?family=Roboto' rel='stylesheet'>
</head>
<style>
.loading {
position: fixed;
width: 100%;
height: 100%;
text-align: center;
padding-top: 200px;
}
.loading-gif {
display: block;
margin: 10px auto;
height: 50%;
width: auto;
}
#loading-text {
font-size: 20px;
padding: 20px;
}
#myDiv {
display: none;
}
body {
margin: 0;
min-width: 320px;
max-width: 400px;
font-family: Roboto, Arial;
background-color: #fff;
}
/* Include the padding and border in an element's total width and height */
* {
box-sizing: border-box;
}
/* Remove margins and padding from the list */
ul {
margin: 0;
padding: 0;
}
/* Style the list items */
ul li {
cursor: pointer;
position: relative;
padding: 12px 8px 12px 40px;
list-style-type: none;
background: #eee;
font-size: 15px;
transition: 0.2s;
/* make the list items unselectable */
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
/* Darker background-color on hover */
ul li:hover {
background: #ddd;
}
/* When clicked on, add a background color and strike out text */
ul li.checked {
background: #888;
color: #fff;
text-decoration: line-through;
}
/* Add a "checked" mark when clicked on */
ul li.checked::before {
content: '';
position: absolute;
border-color: #fff;
border-style: solid;
border-width: 0 2px 2px 0;
top: 10px;
left: 16px;
transform: rotate(45deg);
height: 15px;
width: 7px;
}
/* Style the close button */
.close {
position: absolute;
right: 0;
top: 0;
padding: 12px 16px 12px 16px;
}
.close:hover {
background-color: #f44336;
color: white;
}
/* Style the header */
.header {
padding: 0px 0px;
color: white;
text-align: center;
}
/* Clear floats after the header */
.header:after {
content: "";
display: table;
clear: both;
}
/* Style the input */
input {
border: none;
width: 90%;
padding: 10px;
float: left;
font-size: 20px;
}
/* Style the "Add" button */
.addBtn {
padding: 10px;
width: 10%;
background: #FFFFFF;
color: #555;
float: left;
text-align: center;
font-size: 16px;
cursor: pointer;
transition: 0.3s;
}
.addBtn:hover {
background-color: #bbb;
}
#picaddbtn {
height: auto;
width: 100%;
max-width: 30px;
}
</style>
<body onload="timerOne()" style="margin:0;">
<link rel="stylesheet" href="main.css">
<!-- The Loader Code -->
<div id="loader">
<div id="container" class='loading'>
<img class="loading-gif" id="processing" src= "https://78.media.tumblr.com/a6177f6b977637597850b273022c81ed/tumblr_nurhzkuKQO1syz1nro1_500.gif" alt="Processing" height="25%" />
<div id='loading-text' class='loading-text'>Processing</div>
</div>
</div>
<div style="display:none;" id="myDiv" class="animate-bottom">
<div id="myDIV" class="header">
<span onclick="newElement()" class="addBtn"><i class="material-icons">add</i></span>
<input type="text" id="myInput" placeholder="Add Task" height="40">
</div>
<ul id="myUL">
<li>Add items here</li>
<li>Check them off when you are done</li>
<li>You can add as much as you would like</li>
<li>Make use of the timer below</li>
<li>Stay Organized with Manage+</li>
</ul>
</div>
</div>
<script type='text/javascript' language='javascript' src='script.js'> </script>
</body>
</html>
JS：
// Quote generator
var strings = [
'Only I can change my life',
'Optimism is the faith that leads to achievement',
'With the new day comes new strength and new thoughts',
'Life is 10% what happens to you and 90% how you react to it',
'Failure will never overtake me if my determination to succeed is strong enough'
];
var rand = strings[Math.floor(Math.random() * strings.length)];
document.getElementById('loading-text').innerHTML = rand;
// Loader
function timerOne() {
myVar = setTimeout(showPage, 3000);
}
function showPage() {
document.getElementById("loader").style.display = "none";
document.getElementById("myDiv").style.display = "block";
}
// Create a "close" button and append it to each list item
var myNodelist = document.getElementsByTagName("LI");
var i;
for (i = 0; i < myNodelist.length; i++) {
var span = document.createElement("SPAN");
var txt = document.createTextNode("\u00D7");
span.className = "close";
span.appendChild(txt);
myNodelist[i].appendChild(span);
}
// Click on a close button to hide the current list item
var close = document.getElementsByClassName("close");
var i;
for (i = 0; i < close.length; i++) {
close[i].onclick = function() {
var div = this.parentElement;
div.style.display = "none";
}
}
// Add a "checked" symbol when clicking on a list item
var list = document.querySelector('ul');
list.addEventListener('click', function(ev) {
if (ev.target.tagName === 'LI') {
ev.target.classList.toggle('checked');
}
}, false);
// Create a new list item when clicking on the "Add" button
function newElement() {
var li = document.createElement("li");
var inputValue = document.getElementById("myInput").value;
var t = document.createTextNode(inputValue);
li.appendChild(t);
if (inputValue === '') {
alert("You must write something!");
} else {
document.getElementById("myUL").appendChild(li);
}
document.getElementById("myInput").value = "";
var span = document.createElement("SPAN");
var txt = document.createTextNode("\u00D7");
span.className = "close";
span.appendChild(txt);
li.appendChild(span);
for (i = 0; i < close.length; i++) {
close[i].onclick = function() {
var div = this.parentElement;
div.style.display = "none";
}
}
}
清单：
{
"manifest_version": 2,
"name": "Webapp",
"version": "1.0",
"description": "Webapp",
"matches": ["<all_urls>"],
"js": "script.js",
"browser_action": {
"default_icon": "image.png",
"default_title": "Webapp",
"default_popup": "webapp.html"
},
"permissions": ["tabs","activeTab"]
}
我不确定为什么代码无法正确加载。让我知道我该怎么办。 （如果可能，请发送当前代码的编辑版本。）