判断websocket状态

只要在函数中添加对状态的判断，在状态为OPEN时，执行send方法即可。方法一代码如下：
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”
};
//添加状态判断，当为OPEN时，发送消息
if (socket.readyState===1) {
socket.send(JSON.stringify(message));
}else{
//do something
}
}
也可以设置事件监听，当为OPEN时，执行send操作。方案二代码如下
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);
//添加事件监听
socket.addEventListener(‘open’, function () {
socket.send(message)
});
}
实例对象websocket的onopen属性，可以用来指定连接成功后的回调函数。方案三代码如下：
function TestSockets() {
var socket = new WebSocket(“ws://127.0.0.1:8000/ws”);
//设置连接成功后的回调函数
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);
};
}