Function traverseUpdate

libs/echarts/echarts.simple.js:17244–17259

(el, updater, commonParam)

}

function traverseUpdate(el, updater, commonParam) {
    // If root is group, also enter updater for `highDownOnUpdate`.
    var fromState = NORMAL;
    var toState = NORMAL;
    var trigger;
    // See the rule of `highDownOnUpdate` on `graphic.setAsHighDownDispatcher`.
    el.__highlighted && (fromState = EMPHASIS, trigger = true);
    updater(el, commonParam);
    el.__highlighted && (toState = EMPHASIS, trigger = true);

    el.isGroup && el.traverse(function (child) {
        !child.isGroup && updater(child, commonParam);
    });

    trigger && el.__highDownOnUpdate && el.__highDownOnUpdate(fromState, toState);
}

/**
 * Set hover style (namely "emphasis style") of element, based on the current