标签 javascript
<分区>
我怎样才能得到像这样工作的方法 getValueThroughPath(object, keysArray):
var object = {
key1: {
key2: {
key3: {
key4: "value"
}
}
}
}
getValueThroughPath(object, ['key1', 'key2', 'key3', 'key4']); // = "value" and undefined if wrong path
?
我也在寻找 setValueThroughPath(object, keysArray) 等效方法。
我使用 Lodash如果这可以缩短解决方案。
最佳答案
这会将对象向下移动到最后一个键。如果任何键拼写错误或丢失，它将返回 undefined:
function getValueThroughPath(obj, keys) {
while(obj=obj[keys.shift()] || '', keys.length);
return obj || undefined;
}
function setValueThroughPath(obj, keys, val) {
while(keys.length>1) {
obj[keys[0]]= obj[keys[0]] || {};
obj= obj[keys.shift()];
};
obj[keys[0]]= val;
}
var object = {
key1: {
key2: {
key3: {
key4: "value"
}
}
}
}
setValueThroughPath(object, ['this', 'is', 'a', 'test'], 'Eureka!');
setValueThroughPath(object, ['this', 'is', 'a', 'new', 'test'], 'Hallelujah!');
console.log(getValueThroughPath(object, ['key1', 'key2', 'key3', 'key4'])); // "value"
console.log(getValueThroughPath(object, ['key1', 'key2', 'key5', 'key4'])); // undefined
console.log(getValueThroughPath(object, ['this', 'is', 'a', 'test'])); // "Eureka!"
console.log(getValueThroughPath(object, ['this', 'is', 'a', 'new', 'test'])); // "Hallelujah!"关于Javascript通过连续键数组访问和写入对象子值，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30811009/