Socket.IO built-in event at the time of abnormal flow chart connection

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Reference Soket.IO official document: https: //socket.io/docs/client-api/, client built a total of 10 events, test code is as follows:

socket.on('connect', function(data){
    onlineFlag = true;
    console.log(data + ' - connect');
});
socket.on('connect_error', function(data){
    console.log(data + ' - connect_error');
});
socket.on('connect_timeout', function(data){
    console.log(data + ' - connect_timeout');
});
socket.on('error', function(data){
    console.log(data + ' - error');
});
socket.on('disconnect', function(data){
    onlineFlag = false;
    console.log(data + ' - disconnect');
});
socket.on('reconnect', function(data){
    console.log(data + ' - reconnect');
});
socket.on('reconnect_attempt', function(data){
    console.log(data + ' - reconnect_attempt');
});
socket.on('reconnecting', function(data){
    console.log(data + ' - reconnecting');
});
socket.on('reconnect_error', function(data){
    console.log(data + ' - reconnect_error');
});
socket.on('reconnect_failed', function(data){
    console.log(data + ' - reconnect_failed');
});
socket.on('ping', function(data){
    console.log(data + ' - ping');
});
socket.on('pong', function(data){
    console.log(data + ' - pong');
});

flow chart

Reproduced in: https: //my.oschina.net/u/1464512/blog/3059510