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
669 B
JavaScript
21 lines
669 B
JavaScript
var _getLength = require('./_getLength.js');
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var isArray = require('./isArray.js');
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var isString = require('./isString.js');
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var isArguments = require('./isArguments.js');
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var keys = require('./keys.js');
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// Is a given array, string, or object empty?
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// An "empty" object has no enumerable own-properties.
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function isEmpty(obj) {
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if (obj == null) return true;
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// Skip the more expensive `toString`-based type checks if `obj` has no
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// `.length`.
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var length = _getLength(obj);
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if (typeof length == 'number' && (
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isArray(obj) || isString(obj) || isArguments(obj)
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)) return length === 0;
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return _getLength(keys(obj)) === 0;
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}
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module.exports = isEmpty;
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