javascript 如何连接字符串和数字以制作 JSON 对象？
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How to concatenate string and numbers to make a JSON object?
提问by user2109581
I want to make a JSON object like this:
我想制作一个这样的 JSON 对象：
let lob = { courses_dept: 'sci', courses_avg: 77.09 };
by concatenate variables together:
通过将变量连接在一起：
var dept = "sci";
var avg = 77.09;
let a = '{"courses_dept": dept, "courses_averge": avg }';
but I got SyntaxError if I do this:
但如果我这样做，我会得到 SyntaxError：
let b = JSON.parse(a);
What is the proper way to do this?
这样做的正确方法是什么？
回答by surjikal
If you want to use strings:
如果要使用字符串：
var dept = "sci";
var avg = 77.09;
let a = `{"courses_dept": "${dept}", "courses_averge": ${avg} }`;
This assumes that deptis a string. If you don't know this in advance, wrap each variable with JSON.stringify:
这假设它dept是一个字符串。如果您事先不知道这一点，请将每个变量包装为JSON.stringify：
let b = `{"courses_dept": ${JSON.stringify(dept)}
,"courses_averge": ${JSON.stringify(avg)}}`;
Notice that the string uses backticks ` instead of regular quotes. This allows you to do string interpolation. You can use + if you want to do straight up concatenation.
请注意，该字符串使用反引号 ` 而不是常规引号。这允许您进行字符串插值。如果你想直接连接，你可以使用 + 。
You can also just do a regular object:
你也可以只做一个普通的对象：
let c = {"courses_dept": dept, "courses_averge": avg}
JSON.stringify(c)
回答by surjikal
Why not just plain jsonobject then?
为什么不只是简单的json对象呢？
var dept = "sci";
var avg = 77.09;
let a = {
"courses_dept": dept,
"courses_averge": avg
};
console.log('a', a);回答by user2109581
This way works and seems to be simpler.
这种方式有效，而且似乎更简单。
let b = {};
b["courses_dept"] = dept;
b["courses_averge"] = avg;
回答by YoJey Thilipan
you can make a json with single qouates and concatenate variable. After that you can parse the string
您可以使用单个 qouates 和连接变量制作 json。之后，您可以解析字符串
var id_of_the_product = $('#is-a-gift').data( 'gift_product_id' ) ;
var items_in_cart = (cart_item_count) - (gift_wraps_in_cart);
$.ajax({
type: 'POST',
url: '/cart/update.js',
data: JSON.parse('{ "updates": { "'+ id_of_the_product +'" : "'+items_in_cart+'" }, "attributes": { "gift-wrapping": "'+gift_wrapping_type+'" } }'),
dataType: 'json',
success: function() { }
});
