我有這個 html 檔案
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<style class="INLINE_PEN_STYLESHEET_ID">
body {
font: 14px "Century Gothic", Futura, sans-serif;
margin: 20px;
}
ol, ul {
padding-left: 30px;
}
.board-row:after {
clear: both;
content: "";
display: table;
}
.status {
margin-bottom: 10px;
}
.square {
background: #fff;
border: 1px solid #999;
float: left;
font-size: 24px;
font-weight: bold;
line-height: 34px;
height: 34px;
padding: 0;
text-align: center;
width: 34px;
}
.square:focus {
outline: none;
}
.kbd-navigation .square:focus {
background: #ddd;
}
.game {
display: flex;
flex-direction: row;
}
.game-info {
margin-left: 20px;
}
</style>
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</head>
<body class="mouse-navigation">
<div id="errors" style="
background: #c00;
color: #fff;
display: none;
margin: -20px -20px 20px;
padding: 20px;
white-space: pre-wrap;
"></div>
<div id="root"><div class="game"><div class="game-board"><div><div class="board-row"><button class="square"></button><button class="square"></button><button class="square"></button></div><div class="board-row"><button class="square"></button><button class="square"></button><button class="square"></button></div><div class="board-row"><button class="square"></button><button class="square"></button><button class="square"></button></div></div></div><div class="game-info"><div id="status">Next player: X</div><ol><li><button>Go to game start</button></li></ol></div></div></div>
<script>
window.addEventListener('mousedown', function(e) {
document.body.classList.add('mouse-navigation');
document.body.classList.remove('kbd-navigation');
});
window.addEventListener('keydown', function(e) {
if (e.keyCode === 9) {
document.body.classList.add('kbd-navigation');
document.body.classList.remove('mouse-navigation');
}
});
window.addEventListener('click', function(e) {
if (e.target.tagName === 'A' && e.target.getAttribute('href') === '#') {
e.preventDefault();
}
});
window.onerror = function(message, source, line, col, error) {
var text = error ? error.stack || error : message ' (at ' source ':' line ':' col ')';
errors.textContent = text '\n';
errors.style.display = '';
};
console.error = (function(old) {
return function error() {
errors.textContent = Array.prototype.slice.call(arguments).join(' ') '\n';
errors.style.display = '';
old.apply(this, arguments);
}
})(console.error);
</script>
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<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<script id="INLINE_PEN_JS_ID">
function Square(props) {
return (
React.createElement("button", { className: "square", onClick: props.onClick },
props.value));
}
class Board extends React.Component {
renderSquare(i) {
return (
React.createElement(Square, {
value: this.props.squares[i],
onClick: () => this.props.onClick(i) }));
}
render() {
return (
React.createElement("div", null,
React.createElement("div", { className: "board-row" },
this.renderSquare(0),
this.renderSquare(1),
this.renderSquare(2)),
React.createElement("div", { className: "board-row" },
this.renderSquare(3),
this.renderSquare(4),
this.renderSquare(5)),
React.createElement("div", { className: "board-row" },
this.renderSquare(6),
this.renderSquare(7),
this.renderSquare(8))));
}}
class Game extends React.Component {
constructor(props) {
super(props);
this.state = {
history: [
{
squares: Array(9).fill(null) }],
stepNumber: 0,
xIsNext: true };
}
handleClick(i) {
const history = this.state.history.slice(0, this.state.stepNumber 1);
const current = history[history.length - 1];
const squares = current.squares.slice();
if (calculateWinner(squares) || squares[i]) {
return;
}
squares[i] = this.state.xIsNext ? "X" : "O";
this.setState({
history: history.concat([
{
squares: squares }]),
stepNumber: history.length,
xIsNext: !this.state.xIsNext });
}
jumpTo(step) {
this.setState({
stepNumber: step,
xIsNext: step % 2 === 0 });
}
render() {
const history = this.state.history;
const current = history[this.state.stepNumber];
const winner = calculateWinner(current.squares);
const moves = history.map((step, move) => {
const desc = move ?
'Go to move #' move :
'Go to game start';
return (
React.createElement("li", { key: move },
React.createElement("button", { onClick: () => this.jumpTo(move) }, desc)));
});
let status;
if (winner) {
status = "Winner: " winner;
} else {
status = "Next player: " (this.state.xIsNext ? "X" : "O");
}
return (
React.createElement("div", { className: "game" },
React.createElement("div", { className: "game-board" },
React.createElement(Board, {
squares: current.squares,
onClick: i => this.handleClick(i) })),
React.createElement("div", { className: "game-info" },
React.createElement("div", { id: "status" }, status),
React.createElement("ol", null, moves))));
}}
// ========================================
ReactDOM.render(React.createElement(Game, null), document.getElementById("root"));
function calculateWinner(squares) {
const lines = [
[0, 1, 2],
[3, 4, 5],
[6, 7, 8],
[0, 3, 6],
[1, 4, 7],
[2, 5, 8],
[0, 4, 8],
[2, 4, 6]];
for (let i = 0; i < lines.length; i ) {if (window.CP.shouldStopExecution(0)) break;
const [a, b, c] = lines[i];
if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
return squares[a];
}
}window.CP.exitedLoop(0);
return null;
}
//# sourceURL=pen.js
</script>
</body></html>
這是來自此 codepen 鏈接
uj5u.com熱心網友回復：
按鈕（和其他一些專案）使用 box-sizing 屬性“border-box”而不是“content-box”；這解釋了不同的行為。
參考檔案：
您應該在問題中提供一個較小的可重現示例，以便我們更輕松地除錯出錯的地方。
但正如另一個答案指出的那樣，問題在于某些元素具有不同的默認box-sizing值。
uj5u.com熱心網友回復：
基本上 box-sizing 的作業方式是，它確定元素寬度是否應包括邊框。
例如 -> 如果你有一個寬度為 300px 的 divbox-sizing: border-box像這樣使用
div {
width: 300px;
height: 100px;
border: 10px solid blue;
box-sizing: border-box;
}
那么這個 div 元素的寬度將始終為 300px -> 20px 邊框和 280px 內容 -> 通過添加填充或更改邊框大小，您正在更改內容的大小
如果你box-sizing: content-box像這樣使用：
div {
width: 300px;
height: 100px;
border: 10px solid red;
box-sizing: content-box;
}
div 元素的寬度現在將為 320px -> 300px 內容 20px 邊框寬度。
因此，如果您希望元素的寬度或高度始終為 50px，您可以使用 box-sizing: border-box
轉載請註明出處，本文鏈接：https://www.uj5u.com/qianduan/351434.html
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