我正在使用contenteditable，如果要按Tab键使其缩进1行然后再缩进第二行，则尝试在其中添加内容。我只能使它缩进1行，但不确定如何扩展它。我的代码可能不是正确的选择。
const TAB_KEY = 9;
const ENTER_KEY = 13;
const SHIFT_KEY = 16
const editor = document.querySelector('.editor');
editor.appendChild(document.createElement('li'));
editor.addEventListener('keydown',(e) => {
let code = e.keyCode || e.which;
if (code == TAB_KEY) {
e.preventDefault();
let parent = e.target;
let ul = document.createElement('ul');
let li = document.createElement('li');
ul.appendChild(li);
parent.appendChild(ul);
moveCursorToEnd(li);
} else if (code == ENTER_KEY) {
e.preventDefault();
let parent = e.target;
let li = document.createElement('li');
parent.appendChild(li);
moveCursorToEnd(li);
}
});
function moveCursorToEnd(el) {
el.focus();
document.execCommand('selectAll',false,null);
document.getSelection().collapseToEnd();
}
/*editor.addEventListener('click',(x) => {
x = document.getElementById("b");
if(x.style.fontWeight == "bolder"){
x.style.fontWeight = "normal";
} else {
x.style.fontWeight = "bolder";
}
});*/
function bold(){
if(document.execCommand("bold")){
document.execCommand("normal");
}else{
document.execCommand("bold");
}
}
/*function underline(){
let x = document.getElementById("text");
if(x.style.textDecoration == "underline"){
x.style.textDecoration = "none";
}else{
x.style.textDecoration = "underline";
}
}*/
function underline(){
if(document.execCommand("underline")){
document.execCommand("none");
}else{
document.execCommand("underline");
}
}
/*function italic(){
let x = document.getElementById("text");
if(x.style.fontStyle == "italic"){
x.style.fontStyle = "normal";
}else{
x.style.fontStyle = "italic";
}
}*/
/*Turns the font of the text to Italic*/
function italic(){
if(document.execCommand("italic")){
document.execCommand("normal");
}else{
document.execCommand("italic");
}
}
function highlighSelectedText(){
let sel = window.getSelection().getRangeAt(0);
let selText = sel.extractContents();
let span = document.createElement("span");
span.style.backgroundColor = "yellow";
span.appendChild(selText);
sel.insertNode(span);
}
/*function printPage(){
let printButton = document.getElementById("ul");
printButton.style.visibility = 'hidden';
window.print();
printButton.style.visibility = 'visible';
}*/body{
margin-top:1em;
margin-bottom: 10em;
margin-right: 1em;
margin-left: 1em;
border: solid;
border-color: #0033cc;
background-color: #f6f6f6;
}
div button{
padding: 1em 2em;
color: white;
background-color: #0000cc;
}
div input{
padding: 1em 2em;
color: white;
background-color: #0000cc;
}
div{
list-style-type:square;
list-style-position: inside;
margin-left: 0.25em;
margin-bottom: 5em;
}
section {
padding: 1em 2em;
color: white;
background-color: #0000cc;
}
.editor {
font-weight: normal;
}
div contenteditable{
margin-bottom: 10em;
}<!DOCTYPE html>
<meta charset="utf-8">
<body>
<head>
<title>outliner</title>
<link href="style.css" rel="stylesheet" title="Style">
<div>
<button id="b" onclick="bold()"> B </button>
<button onclick="underline()"> U </button>
<button onclick="italic()"> I </button>
<input type="button" onclick="highlighSelectedText()" value="Highlight"/>
<input id="color" type="color">
<button onclick="document.getElementById('text').style.color = document.getElementById('color').value">Set Colour</button>
<div id="text" class="editor" contenteditable="true" draggable="true"></div>
</div>
</head>
<script type= "text/javascript" src='setting.js'></script>
</body>