126 lines
3.0 KiB
Markdown
126 lines
3.0 KiB
Markdown
---
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id: bad87fee1348bd9aec908855
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title: 给每个元素一个唯一的 id
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challengeType: 0
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forumTopicId: 18191
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dashedName: give-each-element-a-unique-id
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---
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# --description--
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也可以通过 jQuery 根据每个按钮唯一的 id 来定位出它们。
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给每一个按钮设置唯一的 id，以 `target1` 开始，`target6` 结束。
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确保 `target1` 到 `target3` 在 `#left-well` 之中，`target4` 到 `target6` 在 `#right-well` 之中。
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# --hints--
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其中一个 `button` 元素应该有 id `target1`。
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```js
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assert(
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$('#left-well').children('#target1') &&
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$('#left-well').children('#target1').length > 0
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);
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```
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其中一个 `button` 元素应该有 id `target2`。
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```js
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assert(
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$('#left-well').children('#target2') &&
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$('#left-well').children('#target2').length > 0
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);
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```
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其中一个 `button` 元素应该有 id `target3`。
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```js
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assert(
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$('#left-well').children('#target3') &&
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$('#left-well').children('#target3').length > 0
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);
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```
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其中一个 `button` 元素应该有 id `target4`。
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```js
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assert(
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$('#right-well').children('#target4') &&
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$('#right-well').children('#target4').length > 0
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);
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```
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其中一个 `button` 元素应该有 id `target5`。
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```js
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assert(
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$('#right-well').children('#target5') &&
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$('#right-well').children('#target5').length > 0
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);
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```
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其中一个 `button` 元素应有 id `target6`。
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```js
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assert(
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$('#right-well').children('#target6') &&
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$('#right-well').children('#target6').length > 0
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);
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```
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# --seed--
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## --seed-contents--
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```html
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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"></button>
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<button class="btn btn-default target"></button>
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<button class="btn btn-default target"></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"></button>
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<button class="btn btn-default target"></button>
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<button class="btn btn-default target"></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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```
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# --solutions--
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```html
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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"></button>
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<button class="btn btn-default target" id="target2"></button>
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<button class="btn btn-default target" id="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"></button>
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<button class="btn btn-default target" id="target5"></button>
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<button class="btn btn-default target" id="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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```
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