Function stringify

libs/echarts/echarts-en.simple.js:4083–4092

* @param {Array. } arrColor like [12,33,44,0.4] * @param {string} type 'rgba', 'hsva', ... * @return {string} Result color. (If input illegal, return undefined).

(arrColor, type)

 * @return {string} Result color. (If input illegal, return undefined).
 */
function stringify(arrColor, type) {
    if (!arrColor || !arrColor.length) {
        return;
    }
    var colorStr = arrColor[0] + ',' + arrColor[1] + ',' + arrColor[2];
    if (type === 'rgba' || type === 'hsva' || type === 'hsla') {
        colorStr += ',' + arrColor[3];
    }
    return type + '(' + colorStr + ')';
}

/**
 * @module echarts/animation/Animator