前端時間寫了篇怎麼判斷js對象相等的文章,一直在期待大神給點消息,無奈一直杳無音訊,仍是本身寫個函數來進行判斷,下面總結一些經常使用的對象操做的方法。html
咋們來個先抑後揚的方式,先放出幾個基本的東西,埋點伏筆,一會兒就把那方法亮出來,我這文章就沒得寫了。大神們就繞道走吧,哥這是入門級別的,本身覺還挺實用的,就先作個記錄。前端
先來個全局變量 及定義默認的數據類型express
1: var framework = {
2: //定義經常使用的js類型
3: type : {
4: nothing : -1,
5: undefined : 0,
6: string : 1,
7: number : 2,
8: array : 3,
9: regex : 4,
10: bool : 5,
11: method : 6,
12: datetime : 7,
13: object : 8
14: },
15: types:{},
16: addType:function(type,compare){
17: framework.types[type]=compare
18: }
19: };
20:
21: //默認的數據類型判斷
22: framework.addType(framework.type.nothing, function (value) {
23: return value == null;
24: });
25: framework.addType(framework.type.array, function (value) {
26: return value instanceof Array;
27: });
28: framework.addType(framework.type.string, function (value) {
29: return value.substr && value.toLowerCase;
30: });
31: framework.addType(framework.type.number, function (value) {
32: return value.toFixed && value.toExponential;
33: });
34: framework.addType(framework.type.regex, function (value) {
35: return value instanceof RegExp;
36: });
37: framework.addType(framework.type.bool, function (value) {
38: return value == true || value == false;
39: });
40: framework.addType(framework.type.method, function (value) {
41: return value instanceof Function;
42: });
43: framework.addType(framework.type.datetime, function (value) {
44: return value instanceof Date;
45: });
哥原本還擔憂沒啥東西,一貼這點代碼就有點心虛了,有興趣的悠着點耐心點,後面估計還有段距離呀。。。。下面開始進入主題吧。數組
廢話就很少說了,直接貼代碼,這個應該是我的都能看懂的哈,不解釋。。。app
1: framework.util = {
2: //轉換成字符串
3: toString : function (val) {
4: return val == null ? "" : val.toString();
5: },
6:
7: //去除字符串首尾空格
8: trim : function (value) {
9: value = value == null ? "" : value;
10: value = value.toString();
11: return value.replace(/^\s*|\s*$/g, "");
12: },
13: getType : function (obj) {
14:
15: if (obj == null) {
16: return framework.type.nothing;
17: }
18: for (var item in framework.types) {
19: if (framework.types[item](obj)) {
20: return item;
21: }
22: }
23: //不匹配已定義的默認類型,就返回object
24: return framework.type.object;
25: },
26: isType : function (type, value) {
27: return framework.util.getType(value) == type;
28: }
29: }
30: 菜上完了,先嚐下合不合口啊,敲代碼習慣性敲一點驗證下,這樣改起來可以比較快捷的定位到問題在哪。
1: var log =console.log;
2: log(framework.util.getType(null)); // -1 nothing
3: log(framework.util.getType("aaa")); // 1 string
4: log(framework.util.getType(framework)); // 8 object
5: log(framework.util.getType(function(){})); //6 method
6: log(framework.util.getType(3232)); //2 number
7: log(framework.util.getType([])); //3 array
8: log(framework.util.getType(true)); //5 bool
9: log(framework.util.getType(new Date())); //7 datetime
比較幸運的一次性經過了,沒敲錯字母,看好了,要發力了。我以爲仍是一次性上完算了。別拖拖拉拉的了。
這裏直接貼util 對象中的方法啦。不重複貼上面的代碼,測試的本身合併一下就能夠了。
1: //遍歷集合對象
2: each : function (collection, action) {
3: var index = 0;
4: for (var item in collection) {
5: if (collection.hasOwnProperty(item))
6: action(collection[item], index++);
7: }
8: },
9:
10: clone : function (obj) {
11: //判斷是不是數組,是數組克隆每一項
12: if (framework.util.isType(framework.type.array, obj)) {
13: return framework.util.cloneArray(obj);
14: }
15: //克隆對象中的值
16: else if (framework.util.isType(framework.type.object, obj)) {
17: var clone = {};
18: for (var item in obj) {
19: if (obj.hasOwnProperty(item)) //去掉原型鏈中的屬性
20: clone[item] = framework.util.clone(obj[item]);
21: }
22: return clone;
23: }
24: //若是是其餘類型,則直接返回其值
25: else {
26: return obj;
27: }
28: },
29:
30: //進行數組克隆
31: cloneArray : function (array) {
32: var result = [];
33: framework.util.each(array, function (item) {
34: result.push(framework.util.clone(item));
35: });
36: return result;
37: },
38:
39: //路徑轉換
40: getPath : function (path) {
41: return framework.util.toString(path).split(framework.exp.get_path);
42: },
43:
44: //建立句柄執行函數
45: invoke : function (obj, args) {
46: args = args.concat();
47:
48: var path = args[0];
49: var method = framework.util.findValue(obj, path);
50: args = framework.util.select(args, null, 1, null);
51:
52: path = path.replace(/\..*$/, "");
53: var parent = framework.util.findValue(obj, path);
54: obj = parent === method ? obj : parent;
55: try {
56: var result = method.apply(obj, args);
57: return result;
58: } catch (e) {
59: return null;
60: }
61: },
62:
63: //根據路徑找值
64: findValue : function (obj, path) {
65: if (framework.util.isType(framework.type.array, path)) {
66: return this.util.invoke(obj, path);
67:
68: } else if (framework.util.isType(framework.type.string, path)) {
69: path = framework.util.getPath(path);
70: var index = 0;
71: while (obj != null && index < path.length) {
72: obj = obj[path[index++]];
73: }
74: return obj;
75:
76: } else {
77: return obj;
78: }
79: },
80: //對象轉換成數組
81: toArray : function (obj) {
82: var items = [];
83: if (obj.length) {
84: for (var i = 0; i < obj.length; i++) {
85: items.push(obj[i]);
86: }
87: } else {
88: for (var item in obj) {
89: if (obj.hasOwnProperty(item))
90: items.push(obj[item]);
91: }
92: }
93: return items;
94: },
95: equals : function (val1, val2) {
96: //深度判斷對象相等,這個是重點呀,那天就是爲了這個東西糾結我老半天,如今都還在糾結中,一直沒找到好的方法解決。
97: if (framework.util.getType(val1) == framework.util.getType(val1) && framework.util.isType(framework.type.array, val1)) {
98: return framework.util.arrayEquals(val1, val2);
99: } else if (framework.util.getType(val1) == framework.util.getType(val1) && framework.util.isType(framework.type.object, val1)) {
100: var result = true;
101: for (var item in val1) {
102: if (framework.util.isType(framework.type.array, val1[item])) {
103: result = framework.util.arrayEquals(val1[item], val1[item]);
104: } else {
105: result = (val1[item] == val2[item]);
106: }
107: if (result == false)
108: break;
109: }
110: return result;
111: } else {
112: return val1 == val2;
113: }
114:
115: },
116: arrayEquals : function (val1, val2) {
117: if (framework.util.isType(framework.type.array, val1) && framework.util.isType(framework.type.array, val2) && val1.sort().toString() == val2.sort().toString()) {
118: return true;
119: } else {
120: return false;
121: }
122:
123: },
124: //返回索引所在的值
125: elementAt : function (collection, index) {
126: return collection && collection.length > 0 && index < collection.length && index >= 0
127: ? collection[index]
128: : null;
129: },
130:
131: //向目標對象附加屬性
132: apply : function (target, source) {
133: for (var item in source) {
134: if (source.hasOwnProperty(item))
135: target[item] = source[item];
136: }
137: return target;
138: },
139:
140: //獲取at後面的值
141: remaining : function (array, at) {
142: var results = [];
143: for (; at < array.length; at++)
144: results.push(array[at]);
145: return results;
146: },
147:
148: regexEscape : function (val) {
149: return (val ? val : "").toString().replace(framework.exp.escape_regex, "\\$&");
150: },
151:
152: //正則匹配搜索
153: regexMatch : function (expression, source, ignoreCase) {
154:
155: if (this.util.isType(framework.type.regex, expression)) {
156: expression = expression.source;
157: }
158:
159: expression = new RegExp(framework.util.toString(expression), ignoreCase ? "gi" : "g");
160: return framework.util.toString(source).match(expression) != null;
161: }
這個大餐是上完了,驗證下有沒有效果吧。先上個簡單的,出錯了省得出醜。函數
1: var a =new People(12,"abc");
2: var b = a;
3: var c = framework.util.clone(a);
4: log(b==a); //true
5: log(c==a); //false
6: log(c); //固然別忘了驗證下值是否相等。
最後證實仍是可行的,固然這個不是重點,重點在下面,能不能進行深度克隆,這裏爲People 添加一個屬性
2: var a =new People(12,"abc",[12,"bb"]);
3: var b = a;
4: var c = framework.util.clone(a);
5: log(b==a); //true
6: log(c==a); //false
7: log(c); //固然別忘了驗證下值是否相等。
log(a.child==c.child); //false ==判斷是對象的引用是否相等,因此這裏爲false ,原本是想要true的,看下面的語句:
log( framework.util.equals(a,c)) //true 這裏返回的是我所想要的結果。 測試
在這裏其餘的函數就不一一展現了,若是感興趣的本身驗證下結果。
另這個 深度 判斷相等並無作到完美,在數組中存在的對象若是順序調換下,仍是會判斷爲false ,哪位若是有好的方法能夠幫我改進一下。
最好能作到以下兩個結果是相等的。。
a={id:5,name:"dd",[12,value:{id:8,name:」dd」}]}
b={name:」dd」,id:5,[12,value:{name:」dd」,id:8}]}