版本：
文件：
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https://cdn.bootcdn.net/ajax/libs/placeholders/4.0.1/placeholders.jquery.js
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https://cdn.bootcdn.net/ajax/libs/placeholders/4.0.1/placeholders.jquery.min.js
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https://cdn.bootcdn.net/ajax/libs/placeholders/4.0.1/placeholders.js
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https://cdn.bootcdn.net/ajax/libs/placeholders/4.0.1/placeholders.min.js
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https://cdn.bootcdn.net/ajax/libs/placeholders/4.0.1/placeholders.prototype.js
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https://cdn.bootcdn.net/ajax/libs/placeholders/4.0.1/placeholders.prototype.min.js
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https://cdn.bootcdn.net/ajax/libs/placeholders/4.0.1/placeholders.yui3.js
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https://cdn.bootcdn.net/ajax/libs/placeholders/4.0.1/placeholders.yui3.min.js