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53 lines
1.4 KiB
53 lines
1.4 KiB
var staticHGKeyRE = require('./staticHGKeyRE')
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var helperGetHGSKeys = require('./helperGetHGSKeys')
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var hasOwnProp = require('./hasOwnProp')
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var isUndefined = require('./isUndefined')
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var eqNull = require('./eqNull')
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/**
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* 获取对象的属性的值，如果值为 undefined，则返回默认值
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* @param {Object/Array} obj 对象
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* @param {String/Function} property 键、路径
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* @param {Object} defaultValue 默认值
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* @return {Object}
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*/
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function get (obj, property, defaultValue) {
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if (eqNull(obj)) {
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return defaultValue
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}
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var result = getValueByPath(obj, property)
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return isUndefined(result) ? defaultValue : result
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}
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function getDeepProps (obj, key) {
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var matchs = key ? key.match(staticHGKeyRE) : ''
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return matchs ? (matchs[1] ? (obj[matchs[1]] ? obj[matchs[1]][matchs[2]] : undefined) : obj[matchs[2]]) : obj[key]
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}
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function getValueByPath (obj, property) {
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if (obj) {
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var rest, props, len
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var index = 0
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if (obj[property] || hasOwnProp(obj, property)) {
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return obj[property]
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} else {
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props = helperGetHGSKeys(property)
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len = props.length
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if (len) {
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for (rest = obj; index < len; index++) {
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rest = getDeepProps(rest, props[index])
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if (eqNull(rest)) {
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if (index === len - 1) {
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return rest
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}
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return
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}
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}
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}
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return rest
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}
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}
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}
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module.exports = get
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