原生JS的對象經常使用操做總結

   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

類型定義及判斷

  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

先上兩個小菜

   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}]}
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