node . js write stream . hascolors()方法
原文:https://www . geesforgeks . org/node-js-write stream-hascolors-method/
writeStream.hasColors() 方法是 tty 模块中类 writeStream 的内置应用程序编程接口，用于检查该写流对象是否至少支持 count 中提供的颜色。
语法:
const writeStream.hasColors([count][, env])
参数:此方法接受以下参数:
- Count: is the number of different types of colors.
- env: The object containing the environment variable to be checked.
返回值:当且仅当 writeStream 支持的颜色至少与 count 中提供的一样多时，此方法返回布尔值 true。
示例 1: 文件名:index.js
// Node.js program to demonstrate the
// writeStream.hasColors() property
// Importing dgram module
var dgram = require('dgram');
// Creating and initializing client
// and server socket
var client = dgram.createSocket("udp4");
var server = dgram.createSocket("udp4");
// Handling the message event
server.on("message", function (msg) {
// Creating and initializing a WriteStream object
let WriteStream = process.stdout;
// Checking if the this object has the exactly
// same color or not requested by count
// by using hasColors() API
const col = WriteStream.hasColors(16, 777, 216);
// Displaying the result
process.stdout.write(msg + col);
// Exiting process
process.exit();
})
// Binding server with port
.bind(1234, () => {
});
// Client sending message to server
client.send("This object supports at least as"
+ " many colors as provided in count: ",
0, 98, 1234, "localhost");
输出:
该对象支持的颜色至少和 count 中提供的一样多:true
示例 2: 文件名:index.js
Javascript
// Node.js program to demonstrate the
// writeStream.hasColors() method
// Creating and initializing a WriteStream object
let WriteStream = process.stdout;
// Checking if the this object has the exactly
// same color or not requested by count
// by using hasColors() method
const col = WriteStream.hasColors(256);
// Displaying the result
console.log("This object supports at least as "
+ "many colors as provided in count: ", col);
使用以下命令运行 index . js 文件:
node index.js
输出:
该对象至少支持 count 中提供的颜色数量:true
参考: https://nodejs
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