Created
August 11, 2018 04:29
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JS 变量绑定
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| var testData = { | |
| "a.b.c": 9, | |
| gs: [3,1,23], | |
| nest: { | |
| a:233, | |
| "b.c": 911, | |
| b:{ | |
| g: 254, | |
| c: 623 | |
| } | |
| } | |
| } | |
| function bindObjeChangeEvent(obj, propertyName, getter = null, setter = null){ | |
| if(!getter && !setter){ | |
| return; | |
| } | |
| if(obj.hasOwnProperty(propertyName)){ | |
| var val = obj[propertyName]; | |
| if(typeof val == "object" && !Array.isArray(val)){ | |
| return; | |
| } | |
| if(!obj.hasOwnProperty("_store")){ | |
| var store = {}; | |
| Object.defineProperty(obj, "_store", { | |
| "enumerable": false, | |
| "configurable": false, | |
| get: function(){ return store; }, | |
| }); | |
| } | |
| obj._store[propertyName] = obj[propertyName]; | |
| Object.defineProperty(obj, propertyName, { | |
| enumerable: true, | |
| configurable: true, | |
| get: function(){ | |
| if(typeof getter == "function"){ | |
| return getter(obj, obj._store[propertyName]); | |
| } | |
| return val; | |
| }, | |
| set: function(newVal){ | |
| if(typeof setter == "function" && val != newVal){ | |
| setter(obj, propertyName, newVal) | |
| } | |
| } | |
| }); | |
| return; | |
| } | |
| let pathList= propertyName.split("."); | |
| let currObj = obj[pathList.shift()]; | |
| if(pathList.length == 0){ | |
| return; | |
| } | |
| return bindObjeChangeEvent(currObj, pathList.join("."), getter, setter); | |
| } | |
| bindObjeChangeEvent(testData, "nest.b.c", function(obj, val){ | |
| console.log("你读取我干啥呢"); | |
| return val; | |
| }, function(obj, propertyName, newVal){ | |
| var oldVal = obj._store[propertyName]; | |
| console.log("你改我干什么呢 " + oldVal + " -> " + newVal); | |
| obj._store[propertyName] = newVal; | |
| }); | |
| bindObjeChangeEvent(testData, "nest", function(obj, val){ | |
| console.log("nest 你读取我干啥呢"); | |
| return val; | |
| }, function(obj, propertyName, newVal){ | |
| var oldVal = obj._store[propertyName]; | |
| console.log("nest 你改我干什么呢 " + oldVal + " -> " + newVal); | |
| obj._store[propertyName] = newVal; | |
| }); | |
| console.log(testData.nest["b.c"]); | |
| testData.nest["b.c"] = 233; | |
| console.log(testData.nest["b.c"]); | |
| function getSetPath(obj, propertyName, value = undefined){ | |
| if(obj.hasOwnProperty(propertyName)){ | |
| if(value !== undefined){ | |
| obj[propertyName] = value; | |
| } | |
| return obj[propertyName]; | |
| } | |
| let pathList= propertyName.split("."); | |
| let currObj = obj[pathList.shift()]; | |
| if(pathList.length == 0){ | |
| return null; | |
| } | |
| return getSetPath(currObj, pathList.join("."), value); | |
| } |
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