1.内容
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
* {
margin: 0;
padding: 0;
}
body {
display: flex;
justify-content: center;
align-items: center;
}
#container {
position: relative;
}
#right {
overflow: auto;
}
.textarea-container {
float: left;
margin: 20px;
padding: 10px;
width: 500px;
height: 550px;
border: 2px solid gray;
}
.textarea-container::after {
content: "";
display: block;
clear: both;
}
#textarea {
width: 100%;
height: 100%;
resize: none;
outline: none;
border: none;
}
#data-show {
font-size: 16px;
font-weight: 700;
}
.key-styl {
color: #92278F;
}
.value-str-styl {
color: #3AB54A;
}
.value-styl {
color: lightskyblue;
}
#help {
display: inline-block;
width: 20px;
height: 20px;
background-color: #808080;
color: #fff;
border-radius: 10px;
position: absolute;
bottom: 0;
left: 555px;
text-align: center;
line-height: 20px;
}
#help:hover {
cursor: default;
}
#help:hover::before {
position: absolute;
top: 10px;
left: 0;
content: "";
width: 0;
height: 0;
border-width: 10px;
border-style: solid;
border-color: transparent transparent lightgray;
}
#help:hover::after {
position: absolute;
width: 200px;
top: 30px;
left: -95px;
padding: 3px 5px;
color: darkgoldenrod;
content: "暂只支持粘贴数据解析";
background-color: lightgray;
}
</style>
</head>
<body>
<div id="container">
<div id="left" class="textarea-container">
<textarea id="textarea" class="textarea"></textarea>
</div>
<div id="right" class="textarea-container">
<pre id="data-show"></pre>
</div>
<span id="help">?</span>
</div>
</body>
</html>
<script>
window.onload = function() {
keydown();
}
/**
* 键盘按键按下监听
*/
function keydown() {
document.addEventListener(‘keydown‘, function(e) {
if (e.ctrlKey && e.keyCode === 86) {// 监听ctrl+v
keyup();
}
});
}
/**
* 键盘按键释放监听
*/
function keyup() {
document.addEventListener(‘keyup‘, function(e) {
var value = document.getElementById("left").getElementsByClassName("textarea")[0].value;
var showValue = document.getElementById("data-show");
if (e.keyCode === 86) {
if (!isEmpty(value)) {// 判断复制的内容是否为空
doValue(value);
}
}else{
if(isEmpty(value)){// 当按下并释放的按键使粘贴区域的值为空时,清空显示区域内容
showValue.innerHTML = "";
}
}
});
}
/**
* 处理粘贴的内容
* @param {Object} value 复制的文本内容
*/
function doValue(value) {
if (isJson(value)) {// 判断是否为json数据
formatData(value);
} else {
error();
}
}
/**
* 格式化显示数据内容
* @param {Object} value 复制的文本内容
*/
function formatData(value) {
var dataShow = document.getElementById("data-show");
var json = JSON.parse(value);
var result = doJson(json);
dataShow.innerHTML = result;
}
function error() {
alert("数据格式有误！");
}
/**
* 判断内容是否为接送数据
* @param {Object} value 复制的文本内容
*/
function isJson(value) {
try {
JSON.parse(value);
return true;
} catch (e) {
//TODO handle the exception
console.log(e);
}
return false;
}
/**
* 处理json数据
* @param {Object} value 复制的文本内容
*/
function doJson(value) {
var f = Array.isArray(value);
var newValue = "";
if (f) {
newValue += doArray(value, 0);
} else {
newValue += doJsonObject(value, 0);
}
return newValue;
}
/**
* 处理json数组内容
* @param {Object} value 复制的文本内容
* @param {Object} n 数据深度，json数据中是否嵌套json数据
* @param {Object} m 判断是否为最外层数据，1：不为最外层数据
*/
function doArray(value, n, m) {
var newArray = "[\n";
var idt = "";
if (n > 0) {
idt = getSpace(n);
n++;
}
for (var i = 0; i < value.length; i++) {
if (!isEmpty(value[i]) && value[i].constructor === Object) {// 判断嵌套数据是否为json对象,是的话调用处理json对象的方法
newArray += doJsonObject(value[i], n, 1) + ",\n";
} else if (!isEmpty(value[i]) && value[i].constructor === String) {
newArray += idt + " <span class=‘value-str-styl‘>\"" + value[i] + "\"</span>,\n";
} else {
newArray += idt + " <span class=‘value-styl‘>\"" + value[i] + "\"</span>,\n";
}
}
newArray = newArray.trim().substr(0, newArray.length - 2);
newArray += "\n" + idt + "]";
return newArray;
}
/**
* 处理json对象内容
* @param {Object} value 复制的文本内容
* @param {Object} n 数据深度，json数据中是否嵌套json数据
* @param {Object} m 判断是否为最外层数据，1：不为最外层数据
*/
function doJsonObject(value, n, m) {
var newJsonObject = "";
var idt = "";
if (n > 0) {
idt = getSpace(n);
console.log("n:" + idt)
}
if (1 === m) {
newJsonObject = idt + "{\n";
} else {
newJsonObject = "{\n";
}
for (var key in value) {
if (!isEmpty(value[key]) && value[key].constructor === Array) {// 判断嵌套数据是否为json数组,是的话调用处理json数组的方法
newJsonObject += idt + " <span class=‘key-styl‘>\"" + key + "\"</span>:" + doArray(value[key], ++n, 1) +
",\n";
} else if (!isEmpty(value[key]) && value[key].constructor === Object) {// 判断嵌套数据是否为json对象,是的话调用处理json对象的方法
newJsonObject += idt + " <span class=‘key-styl‘>\"" + key + "\"</span>:" + doJsonObject(value[key], ++n,
null) + ",\n";
} else if (!isEmpty(value[key]) && value[key].constructor === String || "" === value[key]) {
newJsonObject += idt + " <span class=‘key-styl‘>\"" + key + "\"</span>:<span class=‘value-str-styl‘>\"" +
value[key] + "\"</span>,\n";
} else {
newJsonObject += idt + " <span class=‘key-styl‘>\"" + key + "\"</span>:<span class=‘value-styl‘>" +
value[key] + "</span>,\n";
}
}
newJsonObject = newJsonObject.trim().substr(0, newJsonObject.length - 2);
newJsonObject += "\n" + idt + "}";
return newJsonObject;
}
/**
* 获取缩进量
* @param {Object} value 数据嵌套深度
*/
function getSpace(value) {
var re = "";
if (!isEmpty(value)) {
for (var i = 0; i < value; i++) {
re += " ";
}
}
return re;
}
/**
* 为空判断
* @param {Object} value
*/
function isEmpty(value) {
if ("" !== value && null !== value && undefined !== value) {
return false;
}
return true;
}
</script>
2.效果
原文：https://www.cnblogs.com/lightbc/p/14321950.html