变量obj={name:“西蒙”,年龄:“20”,服装:{style:“简单”,嬉皮士:假}}for(obj中的var propt){console.log(propt+':'+obj[propt]);}
变量propt如何表示对象的财产?它不是内置方法或属性。为什么它会产生对象中的每个属性?
变量obj={name:“西蒙”,年龄:“20”,服装:{style:“简单”,嬉皮士:假}}for(obj中的var propt){console.log(propt+':'+obj[propt]);}
变量propt如何表示对象的财产?它不是内置方法或属性。为什么它会产生对象中的每个属性?
当前回答
if (typeof obj === 'object' && obj !== null) {
Object.keys(obj).forEach(key => {
console.log("\n" + key + ": " + obj[key]);
});
}
// *** Explanation line by line ***
// Explaining the bellow line
// It checks if obj is neither null nor undefined, which means it's safe to get its keys.
// Otherwise it will give you a "TypeError: Cannot convert undefined or null to object" if obj is null or undefined.
// NOTE 1: You can use Object.hasOwnProperty() instead of Object.keys(obj).length
// NOTE 2: No need to check if obj is an array because it will work just fine.
// NOTE 3: No need to check if obj is a string because it will not pass the 'if typeof obj is Object' statement.
// NOTE 4: No need to check if Obj is undefined because it will not pass the 'if type obj is Object' statement either.
if (typeof obj === 'object' && obj !== null) {
// Explaining the bellow line
// Just like in the previous line, this returns an array with
// all keys in obj (because if code execution got here, it means
// obj has keys.)
// Then just invoke built-in javascript forEach() to loop
// over each key in returned array and calls a call back function
// on each array element (key), using ES6 arrow function (=>)
// Or you can just use a normal function ((key) { blah blah }).
Object.keys(obj).forEach(key => {
// The bellow line prints out all keys with their
// respective value in obj.
// key comes from the returned array in Object.keys(obj)
// obj[key] returns the value of key in obj
console.log("\n" + key + ": " + obj[key]);
});
}
其他回答
在ES的最新实现中,您可以使用Object.entries:
for (const [key, value] of Object.entries(obj)) { }
or
Object.entries(obj).forEach(([key, value]) => ...)
如果您只想迭代这些值,请使用Object.values:
for (const value of Object.values(obj)) { }
or
Object.values(obj).forEach(value => ...)
实现这一点的简单明了的方法,即不迭代原型的现代JS,如下所示:
Object.prototype.iterateProperties = ((callback) => {
Object.keys(obj).filter(key => obj.hasOwnProperty(key)).forEach((key) => {
callback(key, obj[key]);
});
});
解释
这段代码在所有对象的原型中创建了一个可以在每个object实例中访问的函数。该函数迭代对象的所有自己的财产,并运行回调函数,该函数为对象中的每个属性获取(键、值)。
使用示例
obj.iterateProperties((key, value) => console.log(key + ': ' + value));
如果您只想迭代映射属性值,则lodash具有_.mapValues
常量对象={a: 2,b: 3个}常量res=_.map值(obj,v=>v*2)console.log(res)<script src=“https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js“></script>
这是为了。。。in语句(MDN、ECMAScript规范)。
您可以将其读为“对于obj对象中的每个属性,依次将每个属性分配给PROPT变量”。
Object.keys(obj).forEach(key =>
console.log(`key=${key} value=${obj[key]}`)
);