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一个需求中需要用到样式的改变，自然想到了addClass和removeClass，但是在用的犯了一个很低级的错误，导致纠结了半天。
初始写法（错误写法）：
if (isPlayMusic) {
console.log('music-to-paused');
$('.fortune-test-activity-head-music').addClass('.fortune-test-activity-head-music-paused');
isPlayMusic = false;
} else {
console.log('music-to-running');
$('.fortune-test-activity-head-music').removeClass('.fortune-test-activity-head-music-paused');
isPlayMusic = true;
}后来发现原来在addClass和removeClass的class前面不能加'.'。
更改写法（正确写法）：
if (isPlayMusic) {
console.log('music-to-paused');
$('.fortune-test-activity-head-music').addClass('fortune-test-activity-head-music-paused');
isPlayMusic = false;
} else {
console.log('music-to-running');
$('.fortune-test-activity-head-music').removeClass('fortune-test-activity-head-music-paused');
isPlayMusic = true;
}