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åŠ æ³•èµ‹å€¼ï¼ˆ+=） - JavaScript | MDN

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加法赋值运算符（+=）将右操作数的值添加到变量，并将结果分配给该变量。两个操作数的类型决定了加法赋值运算符的行为，可能为加法或拼接。

let a = 2;
let b = "hello";

console.log((a += 3)); // Addition
// Expected output: 5

console.log((b += " world")); // Concatenation
// Expected output: "hello world"

let baz = true;

// Boolean + Number -> 加法
baz += 1; // 2

// Number + Boolean -> 加法
baz += false; // 2

let foo = "foo";

// String + Boolean -> 拼接
foo += false; // "foofalse"

// String + String -> 拼接
foo += "bar"; // "foofalsebar"

let bar = 5;

// Number + Number -> 加法
bar += 2; // 7

// Number + String -> 拼接
bar += "foo"; // "7foo"

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