javascript - 如何将整数添加到二维数组项

Question

假设我在谷歌的控制台中有这样的登录

[[296,279],[304,280],[308,280],[312,280]]

来 self 下面的脚本

evtSource.onmessage = function(e) {
var obj = JSON.parse(e.data);
var line = JSON.stringify(obj.line)
var size = JSON.stringify(obj.lineWidth)
var color = JSON.stringify(obj.lineColor) // Not needed, but defined anyways.
var chat = JSON.stringify(obj.msg)

if (obj.ident === "") //mee
{
$.post("/draw.php?ing=_index", {
            l: (line),
            w : parseInt(obj.lineWidth) + 2,
            c: ("ffffff"),
            o: ("100"),
            f: ("1"),
            _: ("false")
 })
 console.log(line) //Logs the line. (Example in question.)

我如何在记录时将值 20 添加到数组中的每个项目。所以它会记录这样的东西

[[316,299],[324,300],[328,300],[332,300]]

又不是这样的(原文。)

[[296,279],[304,280],[308,280],[312,280]]

Answer 1

使用 map :

const arr = [
  [296, 279],
  [304, 280],
  [308, 280],
  [312, 280]
];

const res = arr.map(e => e.map(f => f + 20));

console.log(res);

.as-console-wrapper {
  max-height: 100% !important;
  top: auto;
}