Function indexOf

libs/echarts/echarts-en.simple.js:462–474

* 查询数组中元素的index * @memberOf module:zrender/core/util

(array, value)

 * @memberOf module:zrender/core/util
 */
function indexOf(array, value) {
    if (array) {
        if (array.indexOf) {
            return array.indexOf(value);
        }
        for (var i = 0, len = array.length; i < len; i++) {
            if (array[i] === value) {
                return i;
            }
        }
    }
    return -1;
}

/**
 * 构造类继承关系