作为javascript开发，简述es中什么是padstart()，padend() ？
在JavaScript的ECMAScript规范中，padStart()和padEnd()是字符串方法，用于在字符串的开始或结束添加指定的字符，直到字符串达到指定的长度。 padStart()方法从字符串的开始添加字符，直到字符串达到指定的长度。它接受两个参数：要达到的长度和填充字符。 例如： ```javascript let str = "Hello"; let paddedStr = str.padStart(10, "0"); console.log(paddedStr); // 输出 "0000Hello" ``` 在这个例子中，padStart()方法将"Hello"字符串的开始添加了六个"0"，直到字符串达到10个字符。 padEnd()方法则从字符串的结束添加字符，直到字符串达到指定的长度。它也接受两个参数：要达到的长度和填充字符。 例如： ```javascript let str = "Hello"; let paddedStr = str.padEnd(10, "0"); console.log(paddedStr); // 输出 "Hello0000" ``` 在这个例子中，padEnd()方法将"Hello"字符串的结束添加了六个"0"，直到字符串达到10个字符。 [2023-11-09 01:27:13 | AI写代码神器 | 247点数解答]
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