flying-hero
96f6318101
新增: - backend/venv/ - Python 虚拟环境 - backend/start.sh - 启动脚本（使用虚拟环境） - backend/requirements.txt - 依赖列表 - .gitignore - 忽略虚拟环境和缓存文件 说明: - 每个项目使用独立虚拟环境 - 避免依赖冲突 - 启动脚本自动创建和激活虚拟环境
21 lines
733 B
JavaScript
21 lines
733 B
JavaScript
'use strict';
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var $ = require('../internals/export');
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var toObject = require('../internals/to-object');
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var lengthOfArrayLike = require('../internals/length-of-array-like');
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var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
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var addToUnscopables = require('../internals/add-to-unscopables');
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// `Array.prototype.at` method
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// https://tc39.es/ecma262/#sec-array.prototype.at
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$({ target: 'Array', proto: true }, {
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at: function at(index) {
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var O = toObject(this);
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var len = lengthOfArrayLike(O);
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var relativeIndex = toIntegerOrInfinity(index);
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var k = relativeIndex >= 0 ? relativeIndex : len + relativeIndex;
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return (k < 0 || k >= len) ? undefined : O[k];
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}
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});
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addToUnscopables('at');
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