| 59 | * @param {Function} fn The callback to invoke for each item |
| 60 | */ |
| 61 | export function forEach (obj, fn) { |
| 62 | // Don't bother if no value provided |
| 63 | if (obj === null || typeof obj === 'undefined') { |
| 64 | return |
| 65 | } |
| 66 | |
| 67 | // Force an array if not already something iterable |
| 68 | if (typeof obj !== 'object') { |
| 69 | /*eslint no-param-reassign:0*/ |
| 70 | obj = [obj] |
| 71 | } |
| 72 | |
| 73 | if (isArray(obj)) { |
| 74 | // Iterate over array values |
| 75 | for (var i = 0, l = obj.length; i < l; i++) { |
| 76 | fn.call(null, obj[i], i, obj) |
| 77 | } |
| 78 | } else { |
| 79 | // Iterate over object keys |
| 80 | for (var key in obj) { |
| 81 | if (Object.prototype.hasOwnProperty.call(obj, key)) { |
| 82 | fn.call(null, obj[key], key, obj) |
| 83 | } |
| 84 | } |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * 是否为boolean 值 |