[英]How to retrieve a value already initialized in an associative array
I wish I didn't have to rewrite some things that could just be copied from a variable in an associative array created.我希望我不必重写一些可以从创建的关联数组中的变量复制的东西。
That is my code, but I got an error that says title is not defined :那是我的代码,但我收到一个错误,提示标题未定义:
const shopLocation = {
"uccle-heros": {
title: "Uccle Héros Defré",
location: [4.334562, 50.043438],
description: '<strong>'
+ title
+ '</strong>'
+ '<p>'
+ '<a id="test" '
+ 'href="http://www.mtpleasantdc.com/makeitmtpleasant" '
+ 'target="_blank" '
+ 'title="Opens in a new window">'
+ 'Make it Mount Pleasant</a>'
+ 'is a handmade and vintage market and afternoon of live '
+ 'entertainment and kids activities. 12:00-6:00 p.m.'
+ '</p>'
}
};
You need to use a getter :您需要使用吸气剂:
const shopLocation = { "uccle-heros": { title: "Uccle Héros Defré", location: [4.334562, 50.043438], get description() { return '<strong>' + this.title + '</strong><p><a id="test" href="http://www.mtpleasantdc.com/makeitmtpleasant" target="_blank" title="Opens in a new window">Make it Mount Pleasant</a> is a handmade and vintage market and afternoon of live entertainment and kids activities. 12:00-6:00 pm</p>' } } }; console.log(shopLocation)
In addition to @Spectric's answer , use interpolated strings .除了@Spectric 的答案,使用插值字符串。 Much more readable:更具可读性:
const shopLocation = {
"uccle-heros": {
title: "Uccle Héros Defré",
location: [4.334562, 50.043438],
get description() {
return `
<strong>${this.title}</strong>
<p>
<a
id="test"
href="http://www.mtpleasantdc.com/makeitmtpleasant"
target="_blank"
title="Opens in a new window"
>
Make it Mount Pleasant
</a>
is a handmade and vintage market and afternoon
of live entertainment and kids activities.
12:00-6:00 p.m.
</p>`
}
}
};
console.log(shopLocation)
Ok first of this is called an object in javascript好的,首先在 javascript 中称为 object
secondly in order to reference something nested in a nested object like this you have to call it as such shopLocation['uccle-heros'].title
其次,为了引用嵌套在像这样的嵌套 object 中的东西,你必须这样称呼它shopLocation['uccle-heros'].title
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