jQuery 有“存在”函數嗎？ - Is there an "exists" function for jQuery?

問題：

How can I check the existence of an element in jQuery?如何檢查jQuery中元素的存在？

The current code that I have is this:我目前的代碼是這樣的：

if ($(selector).length > 0) {
    // Do something
}

Is there a more elegant way to approach this?有沒有更優雅的方法來解決這個問題？ Perhaps a plugin or a function?也許是插件或功能？

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解決方案：

參考一： https://en.stackoom.com/question/84i參考二： https://stackoom.com/question/84i