使用正则表达式键匹配 Javascript 循环遍历对象获取值
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Loop through object get value using regex key matches Javascript
提问by vetri02
var obj = {
Fname1: "John",
Lname1: "Smith",
Age1: "23",
Fname2: "Jerry",
Lname2: "Smith",
Age2: "24"
}
with an object like this.Can i get the value using regex on key something like Fname*,Lname* and get the values.
使用这样的对象。我可以在键上使用正则表达式获取值，例如 Fname*,Lname* 并获取值。
回答by Parth Thakkar
Yes, sure you can. Here's how:
是的，当然可以。就是这样：
for(var key in obj) {
if(/^Fname/.test(key))
... do something with obj[key]
}
This was the regex way, but for simple stuff, you may want to use indexOf(). How? Here's how:
这是正则表达式的方式，但对于简单的东西，您可能想要使用indexOf(). 如何？就是这样：
for(var key in obj) {
if(key.indexOf('Fname') == 0) // or any other index.
... do something with obj[key]
}
And if you want to do something with a list of attributes, i mean that you want values of all the attributes, you may use an array to store those attributes, match them using regex/indexOf - whatever convenient - and do something with those values...I'd leave this task to you.
如果你想对属性列表做一些事情，我的意思是你想要所有属性的值，你可以使用一个数组来存储这些属性，使用 regex/indexOf 匹配它们 - 无论方便 - 并用这些值做一些事情......我会把这个任务留给你。
回答by Blazemonger
You can sidestep the entire problem by using a more complete object instead:
您可以通过使用更完整的对象来回避整个问题：
var objarr = [
{fname: "John", lname: "Smith", age: "23"},
{fname: "jerry", lname: "smith", age: "24"}
] ;
objarr[0].fname; // = "John"
objarr[1].age; // = "24"
Or, if you really need an object:
或者，如果你真的需要一个对象：
var obj = { people: [
{fname: "John", lname: "Smith", age: "23"},
{fname: "jerry", lname: "smith", age: "24"}
]} ;
obj.people[0].fname; // = "John"
obj.people[1].age; // = "24"
Now, instead of using a regex, you can easily loop through the array by varying the array index:
现在，您可以通过改变数组索引轻松地循环遍历数组，而不是使用正则表达式：
for (var i=0; i<obj.people.length; i++) {
var fname = obj.people[i].fname;
// do something with fname
}
回答by John Shepard
With jquery:
使用 jquery：
$.each(obj, function (index,value) {
//DO SOMETHING HERE WITH VARIABLES INDEX AND VALUE
});
回答by agent-j
values = []
for(name in obj) {
if (obj.hasOwnProperty(name) && name.test(/Fname|Lname/i) values[name] = obj[name];
}
回答by Ralph Cowling
Quick key matcher using includes()
使用 includes() 的快速键匹配器
I love the new includesfunction. You can use it to check for the existence of a key or return its value.
我喜欢新的包含功能。您可以使用它来检查键是否存在或返回其值。
var obj = {
Fname1: "John",
Lname1: "Smith",
Age1: "23",
Fname2: "Jerry",
Lname2: "Smith",
Age2: "24"
};
var keyMatch = function (object, str) {
for (var key in object) {
if (key.includes(str)) {
return key;
}
}
return false;
};
var valMatch = function (object, str) {
for (var key in object) {
if (key.includes(str)) {
return object[key];
}
}
return false;
};
// usage
console.log(keyMatch(obj, 'Fn')) // test exists returns key => "Fname1"
console.log(valMatch(obj, 'Fn')) // return value => "John"
If you haven't got ES2015 compilation going on, you can use
如果你还没有进行 ES2015 编译，你可以使用
~key.indexOf(str)
~key.indexOf(str)
