jsdk-offical/examples/jsfx/textarea/textarea_event.js

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JS.imports('$jsfx').then(() => {
    let fn = function (e, ...args) {
        Assert.true(Types.isKlass(this, TextArea));
        Assert.true(Types.ofKlass(e, Event));
        JSLogger.info(this, e.type, args);
    };
    new TextArea({
        id: 'txt1',
        listeners: {
            changed: fn
        }
    });
});