1：split()
    以指定的分割字符将string对象分割成数组

    1. var lrc = `[00:01.06]难念的经
    2. [00:03.95]演唱：周华健
    3. [00:06.78]
    4. [00:30.96]笑你我枉花光心计
    5. `;
    6. var parts = lrc.split("\n");
    7. // 结果为 parts["[00:01.06]难念的经","[00:03.95]演唱：周华健"，“[00:06.78]”，“[00:30.96]笑你我枉花光心计”]

    2：substr()
    返回一个字符串中从指定位置开始到指定字符数的字符

    1. var lrc = ["[00:01.06"]
    2. var time = lrc[0].substr(1);
    3. //time 结果为 time = ["00:01.06"]