Function modifyLabelStyle

libs/echarts/echarts-en.simple.js:17539–17552

* Modify label style manually. * Only works after `setLabelStyle` and `setElementHoverStyle` called. * * @param {module:zrender/src/Element} el * @param {Object} [normalStyleProps] optional * @param {Object} [emphasisStyleProps] optional

(el, normalStyleProps, emphasisStyleProps)

 * @param {Object} [emphasisStyleProps] optional
 */
function modifyLabelStyle(el, normalStyleProps, emphasisStyleProps) {
    var elStyle = el.style;
    if (normalStyleProps) {
        rollbackDefaultTextStyle(elStyle);
        el.setStyle(normalStyleProps);
        applyDefaultTextStyle(elStyle);
    }
    elStyle = el.__hoverStl;
    if (emphasisStyleProps && elStyle) {
        rollbackDefaultTextStyle(elStyle);
        extend(elStyle, emphasisStyleProps);
        applyDefaultTextStyle(elStyle);
    }
}

/**
 * Set basic textStyle properties.