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<!DOCTYPE html> |
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<html lang="en"> |
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<head> |
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<meta charset="UTF-8"> |
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<title>动态列表</title> |
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<style> |
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* { |
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margin: 0; |
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padding: 0; |
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} |
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body { |
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background-color: #000; |
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color: #fff; |
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} |
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#app { |
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width: 40%; |
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margin: 20px auto; |
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} |
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#fruits>li { |
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width: 90%; |
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height: 50px; |
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background-color: #6ca; |
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margin: 4px 0; |
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text-align: center; |
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font-size: 20px; |
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list-style-type: none; |
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line-height: 50px; |
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} |
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#fruits>li>a { |
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float: right; |
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color: #fff; |
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text-decoration: none; |
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margin-right: 10px; |
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} |
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#fruits+div { |
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margin-top: 20px; |
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} |
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#fname { |
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width: 70%; |
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height: 40px; |
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color: #fff; |
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border-radius: 8px; |
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border: none; |
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outline: none; |
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font-size: 20px; |
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text-align: center; |
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vertical-align: middle; |
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background-color: #999; |
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} |
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#ok { |
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width: 19%; |
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height: 40px; |
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color: #fff; |
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background-color: #a45; |
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border: none; |
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outline: none; |
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font-size: 16px; |
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vertical-align: middle; |
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} |
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</style> |
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</head> |
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<body> |
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<div id="app"> |
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<ul id="fruits"> |
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<li>苹果<a href="">×</a></li> |
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<li>香蕉<a href="">×</a></li> |
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<li>榴莲<a href="">×</a></li> |
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<li>火龙果<a href="">×</a></li> |
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</ul> |
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<div> |
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<input type="text" id="fname"> |
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<button id="ok">确定</button> |
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</div> |
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</div> |
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<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script> |
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<script> |
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// 1. $函数的参数是一个函数,该函数是页面加载完成后执行的回调函数 |
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$(() => { |
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function removeItem(evt) { |
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evt.preventDefault() |
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// 4. $函数的参数是原生JavaScript对象,返回该原生JavaScript对象对应的jQuery对象 |
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$(evt.target).parent().remove() |
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} |
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function addItem(evt) { |
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let fname = $('#fname').val().trim() |
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if (fname.length > 0) { |
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$('#fruits').append( |
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// 3. $函数的参数是标签字符串,创建对应的标签元素并返回jQuery对象 |
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$('<li>').text(fname).append( |
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$('<a>').attr('href', '').text('×') |
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.on('click', removeItem) |
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) |
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) |
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} |
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$('#fname').val('') |
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// jQuery对象通过下标运算或get方法可以获得与之对应的原生JavaScript对象 |
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// input.get(0).focus() |
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$('#fname')[0].focus() |
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} |
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// 2. $函数的参数是选择器字符串,返回对应元素的jQuery对象 |
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$('#fruits a').on('click', removeItem) |
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$('#ok').on('click', addItem) |
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$('#fname').on('keydown', (evt) => { |
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let code = evt.keyCode || evt.which |
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if (code == 13) { |
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addItem(evt) |
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} |
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}) |
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}) |
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</script> |
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</body> |
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</html> |