.filter(function (email) { return /^t/.test(email); })
时间: 2024-03-19 09:41:19 浏览: 19
这是一个 JavaScript 代码片段,它使用数组的 `filter()` 方法来筛选以字母 "t" 开头的字符串。具体来说,它接受一个名为 `email` 的参数,然后使用正则表达式 `/^t/` 来测试该字符串是否以字母 "t" 开头。如果测试结果为真,则该字符串被保留在数组中,否则被过滤掉。最终,该代码片段返回一个新的数组,其中只包含以字母 "t" 开头的字符串。
相关问题
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Vue-upload-component Test</title> <script src="https://unpkg.com/vue"></script> <script src="https://unpkg.com/vue-upload-component"></script> </head> <body> <div id="app"> <ul> <li v-for="file in files">{{file.name}} - Error: {{file.error}}, Success: {{file.success}}</li> </ul> <file-upload ref="upload" v-model="files" post-action="/post.method" put-action="/put.method" @input-file="inputFile" @input-filter="inputFilter" > Upload file </file-upload> <button v-show="!$refs.upload || !$refs.upload.active" @click.prevent="$refs.upload.active = true" type="button">Start upload</button> <button v-show="$refs.upload && $refs.upload.active" @click.prevent="$refs.upload.active = false" type="button">Stop upload</button> </div> <script> new Vue({ el: '#app', data: function () { return { files: [] } }, components: { FileUpload: VueUploadComponent }, methods: { /** * Has changed * @param Object|undefined newFile Read only * @param Object|undefined oldFile Read only * @return undefined */ inputFile: function (newFile, oldFile) { if (newFile && oldFile && !newFile.active && oldFile.active) { // Get response data console.log('response', newFile.response) if (newFile.xhr) { // Get the response status code console.log('status', newFile.xhr.status) } } }, /** * Pretreatment * @param Object|undefined newFile Read and write * @param Object|undefined oldFile Read only * @param Function prevent Prevent changing * @return undefined */ inputFilter: function (newFile, oldFile, prevent) { if (newFile && !oldFile) { // Filter non-image file if (!/\.(jpeg|jpe|jpg|gif|png|webp)$/i.test(newFile.name)) { return prevent() } } // Create a blob field newFile.blob = '' let URL = window.URL || window.webkitURL if (URL && URL.createObjectURL) { newFile.blob = URL.createObjectURL(newFile.file) } } } }); </script> </body> </html> 将这个页面改为 vue3 的写法
好的,下面是将这个页面改为 Vue 3 的写法:
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Vue-upload-component Test</title>
<script src="https://unpkg.com/vue@next"></script>
<script src="https://unpkg.com/vue-upload-component@3.0.0-beta.6"></script>
</head>
<body>
<div id="app">
<ul>
<li v-for="file in files">{{file.name}} - Error: {{file.error}}, Success: {{file.success}}</li>
</ul>
<file-upload
ref="upload"
v-model="files"
:post-action="'/post.method'"
:put-action="'/put.method'"
@input-file="inputFile"
@input-filter="inputFilter"
>
Upload file
</file-upload>
<button v-show="!$refs.upload || !$refs.upload.active" @click.prevent="$refs.upload.active = true" type="button">Start upload</button>
<button v-show="$refs.upload && $refs.upload.active" @click.prevent="$refs.upload.active = false" type="button">Stop upload</button>
</div>
<script>
const { createApp, ref } = Vue;
const { VueUploadComponent } = vueUploadComponent;
createApp({
setup() {
const files = ref([]);
const inputFile = (newFile, oldFile) => {
if (newFile && oldFile && !newFile.active && oldFile.active) {
// Get response data
console.log('response', newFile.response);
if (newFile.xhr) {
// Get the response status code
console.log('status', newFile.xhr.status);
}
}
};
const inputFilter = (newFile, oldFile, prevent) => {
if (newFile && !oldFile) {
// Filter non-image file
if (!/\.(jpeg|jpe|jpg|gif|png|webp)$/i.test(newFile.name)) {
return prevent();
}
}
// Create a blob field
newFile.blob = ''
let URL = window.URL || window.webkitURL
if (URL && URL.createObjectURL) {
newFile.blob = URL.createObjectURL(newFile.file)
}
};
return {
files,
inputFile,
inputFilter
}
},
components: {
'file-upload': VueUploadComponent
}
}).mount('#app');
</script>
</body>
</html>
```
主要变化如下:
- 使用 `createApp` 创建 Vue 实例;
- 使用 `ref` 创建响应式变量;
- 使用 `setup` 函数代替 `data` 属性;
- 使用 `VueUploadComponent` 替代 `vueUploadComponent`;
- 使用 `v-bind` 缩写 `:` 替代 `v-bind`;
- 使用 `v-on` 缩写 `@` 替代 `v-on`;
- 使用 `file-upload` 替代 `file-upload`。
var arrjiao = value.filter(function (v) { return arranswer.indexOf(v) !== -1 })
I am an AI language model and I can see that the given code is written in JavaScript. This code filters out the elements from the `value` array that are also present in the `arranswer` array and stores the filtered elements in the `arrjiao` array.
Here's a breakdown of the code:
- `filter()` is a built-in function in JavaScript that creates a new array with all elements that pass the test implemented by the provided function.
- The provided function takes an argument `v` which represents the current element being processed in the `value` array.
- `indexOf()` is a built-in function in JavaScript that returns the first index at which a given element can be found in the array, or -1 if it is not present.
- The `!== -1` condition checks if the current element in the `value` array is also present in the `arranswer` array.
- If the condition is true, the current element is included in the `arrjiao` array.
In simpler terms, the code is filtering out the common elements between two arrays and storing them in a new array.
相关推荐
![7z](https://img-home.csdnimg.cn/images/20210720083312.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
翻译一下这个代码:table.render({ elem: '#test' ,url:'/xlSpider/getDataFromDB' ,where:{"keyword":$("#keyword").val()} ,toolbar: '#toolbarDemo' //开启头部工具栏,并为其绑定左侧模板 ,defaultToolbar: ['filter', 'exports', 'print', { //自定义头部工具栏右侧图标。如无需自定义,去除该参数即可 title: '提示' ,layEvent: 'LAYTABLE_TIPS' ,icon: 'layui-icon-tips' }] ,id: 'testReload' ,title: '爬取内容结果' ,cols: [[ {type: 'checkbox', fixed: 'left'} ,{field:'id', title:'排名', width:200, fixed: 'left', unresize: true, sort: true} ,{field:'content', title:'内容', width:300, edit: 'text'} ,{field:'url', title:'访问路径', width:300, edit: 'text',templet: function(res){ return ''+ res.url +'' } } ]] ,page: true });
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)