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      首頁 > 網站開發 > JQuery >
      • JavaScript教程之jQuery 遍歷

      • 2017-05-09 21:41 來源:未知

      jQuery 遍歷


      什么是遍歷?

      jQuery 遍歷,意為"移動",用于根據其相對于其他元素的關系來"查找"(或選取)HTML 元素。以某項選擇開始,并沿著這個選擇移動,直到抵達您期望的元素為止。

      下圖展示了一個家族樹。通過 jQuery 遍歷,您能夠從被選(當前的)元素開始,輕松地在家族樹中向上移動(祖先),向下移動(子孫),水平移動(同胞)。這種移動被稱為對 DOM 進行遍歷。

      jQuery Dimensions

      圖示解析:

      • <div> 元素是 <ul> 的父元素,同時是其中所有內容的祖先。
      • <ul> 元素是 <li> 元素的父元素,同時是 <div> 的子元素
      • 左邊的 <li> 元素是 <span> 的父元素,<ul> 的子元素,同時是 <div> 的后代。
      • <span> 元素是 <li> 的子元素,同時是 <ul> 和 <div> 的后代。
      • 兩個 <li> 元素是同胞(擁有相同的父元素)。
      • 右邊的 <li> 元素是 <b> 的父元素,<ul> 的子元素,同時是 <div> 的后代。
      • <b> 元素是右邊的 <li> 的子元素,同時是 <ul> 和 <div> 的后代。

      lamp 祖先是父、祖父、曾祖父等等。后代是子、孫、曾孫等等。同胞擁有相同的父。


      遍歷 DOM

      jQuery 提供了多種遍歷 DOM 的方法。

      遍歷方法中最大的種類是樹遍歷(tree-traversal)。

      下一章會講解如何在 DOM 樹中向上、下以及同級移動。

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