判斷websocket狀態

只要在函數中添加對狀態的判斷，在狀態爲OPEN時，執行send方法即可。方法一代碼如下：
function TestSockets() {
var socket = new WebSocket(“ws://127.0.0.1:8000/ws”);
var message = {
nickname: “benben_2015”,
email: “[email protected]”,
content: “I love programming”
};
//添加狀態判斷，當爲OPEN時，發送消息
if (socket.readyState===1) {
socket.send(JSON.stringify(message));
}else{
//do something
}
}
也可以設置事件監聽，當爲OPEN時，執行send操作。方案二代碼如下
function TestSockets() {
var socket = new WebSocket(“ws://127.0.0.1:8000/ws”);
var message = {
nickname: “benben_2015”,
email: “[email protected]”,
content: “I love programming”
};
message = JSON.stringify(message);
//添加事件監聽
socket.addEventListener(‘open’, function () {
socket.send(message)
});
}
實例對象websocket的onopen屬性，可以用來指定連接成功後的回調函數。方案三代碼如下：
function TestSockets() {
var socket = new WebSocket(“ws://127.0.0.1:8000/ws”);
//設置連接成功後的回調函數
socket.onopen=function () {
console.log(“socket has been opened”);
var message = {
nickname: “benben_2015”,
email: “[email protected]”,
content: “I love programming”
};
message = JSON.stringify(message);
socket.send(message);
};
}