2018-10-10 18:03:03 -04:00
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---
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id: bad87fee1348bd9aed308826
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2021-03-05 08:43:24 -07:00
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title: 使用 jQuery 选择元素的父元素
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2018-10-10 18:03:03 -04:00
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challengeType: 6
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2020-09-07 16:17:51 +08:00
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forumTopicId: 18321
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2021-01-13 03:31:00 +01:00
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dashedName: target-the-parent-of-an-element-using-jquery
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2018-10-10 18:03:03 -04:00
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---
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2020-12-16 00:37:30 -07:00
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# --description--
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2021-03-05 08:43:24 -07:00
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每个 HTML 标签都默认 `inherits`（继承）其 `parent`（父标签）的 CSS 属性。
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2020-12-16 00:37:30 -07:00
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2021-03-05 08:43:24 -07:00
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例如，`h3` 标签 `jQuery Playground` 的父标签是 `<div class="container-fluid">`，而这个标签的父标签是 `body`。
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2020-12-16 00:37:30 -07:00
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2021-03-05 08:43:24 -07:00
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jQuery 有一个 `parent()` 方法，可以访问被选取标签的父标签。
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2020-12-16 00:37:30 -07:00
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2021-03-05 08:43:24 -07:00
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下面的代码展示了使用 `parent()` 方法把 `left-well` 标签的父标签背景色设置成蓝色（blue）：
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2020-12-16 00:37:30 -07:00
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2021-03-22 07:52:28 -06:00
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```js
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$("#left-well").parent().css("background-color", "blue")
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```
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2020-12-16 00:37:30 -07:00
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2021-03-22 07:52:28 -06:00
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把 `#target1` 元素的父元素背景色设置成红色（red）。
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2018-10-10 18:03:03 -04:00
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2020-12-16 00:37:30 -07:00
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# --hints--
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2021-03-22 07:52:28 -06:00
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`left-well` 元素应该有红色的背景。
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2020-12-16 00:37:30 -07:00
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```js
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assert(
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$('#left-well').css('background-color') === 'red' ||
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$('#left-well').css('background-color') === 'rgb(255, 0, 0)' ||
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$('#left-well').css('background-color').toLowerCase() === '#ff0000' ||
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$('#left-well').css('background-color').toLowerCase() === '#f00'
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);
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2018-10-10 18:03:03 -04:00
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```
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2021-03-22 07:52:28 -06:00
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应该用 `.parent()` 函数修改该元素。
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2020-12-16 00:37:30 -07:00
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```js
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assert(code.match(/\.parent\s*\(\s*\)\s*\.css/g));
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2018-10-10 18:03:03 -04:00
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```
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2021-03-22 07:52:28 -06:00
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应该在 `#target1` 元素上调用 `.parent()` 方法。
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2020-12-16 00:37:30 -07:00
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```js
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assert(
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code.match(/\$\s*?\(\s*?(?:'|")\s*?#target1\s*?(?:'|")\s*?\)\s*?\.parent/gi)
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);
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```
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2021-03-22 07:52:28 -06:00
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应该仅用 jQuery 给元素添加 class。
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2020-12-16 00:37:30 -07:00
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```js
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assert(code.match(/<div class="well" id="left-well">/g));
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2018-10-10 18:03:03 -04:00
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```
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2020-08-13 17:24:35 +02:00
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2021-01-13 03:31:00 +01:00
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# --seed--
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## --seed-contents--
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```html
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<script>
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$(document).ready(function() {
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$("#target1").css("color", "red");
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$("#target1").prop("disabled", true);
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$("#target4").remove();
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$("#target2").appendTo("#right-well");
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$("#target5").clone().appendTo("#left-well");
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});
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</script>
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<!-- Only change code above this line -->
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<body>
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<div class="container-fluid">
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<h3 class="text-primary text-center">jQuery Playground</h3>
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<div class="row">
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<div class="col-xs-6">
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<h4>#left-well</h4>
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<div class="well" id="left-well">
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<button class="btn btn-default target" id="target1">#target1</button>
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<button class="btn btn-default target" id="target2">#target2</button>
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<button class="btn btn-default target" id="target3">#target3</button>
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</div>
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</div>
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<div class="col-xs-6">
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<h4>#right-well</h4>
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<div class="well" id="right-well">
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<button class="btn btn-default target" id="target4">#target4</button>
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<button class="btn btn-default target" id="target5">#target5</button>
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<button class="btn btn-default target" id="target6">#target6</button>
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</div>
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</div>
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</div>
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</div>
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</body>
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```
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2020-12-16 00:37:30 -07:00
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# --solutions--
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2020-09-07 16:17:51 +08:00
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2021-01-13 03:31:00 +01:00
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```html
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<script>
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$(document).ready(function() {
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$("#target1").css("color", "red");
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$("#target1").prop("disabled", true);
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$("#target4").remove();
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$("#target2").appendTo("#right-well");
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$("#target5").clone().appendTo("#left-well");
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$("#target1").parent().css("background-color", "red");
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});
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</script>
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<!-- Only change code above this line -->
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<body>
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<div class="container-fluid">
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<h3 class="text-primary text-center">jQuery Playground</h3>
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<div class="row">
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<div class="col-xs-6">
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<h4>#left-well</h4>
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<div class="well" id="left-well">
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<button class="btn btn-default target" id="target1">#target1</button>
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<button class="btn btn-default target" id="target2">#target2</button>
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<button class="btn btn-default target" id="target3">#target3</button>
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</div>
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</div>
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<div class="col-xs-6">
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<h4>#right-well</h4>
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<div class="well" id="right-well">
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<button class="btn btn-default target" id="target4">#target4</button>
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<button class="btn btn-default target" id="target5">#target5</button>
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<button class="btn btn-default target" id="target6">#target6</button>
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</div>
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</div>
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</div>
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</div>
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</body>
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```
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