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---
id: 56533eb9ac21ba0edf2244b1
title: 複合賦值之 *=
challengeType: 1
videoUrl: 'https://scrimba.com/c/c83vrfa'
forumTopicId: 16662
dashedName: compound-assignment-with-augmented-multiplication
---
# --description--
`*=` 操作符是讓變量與一個數相乘並賦值。
```js
myVar = myVar * 5;
```
`myVar` 乘以 `5`。 等價於:
```js
myVar *= 5;
```
# --instructions--
使用 `*=` 操作符對 `a``b``c` 實現賦值相乘操作。
# --hints--
`a` 應該等於`25`
```js
assert(a === 25);
```
`b` 應該等於`36`
```js
assert(b === 36);
```
`c` 應該等於`46`
```js
assert(c === 46);
```
應該對每個變量使用 `*=` 操作符。
```js
assert(code.match(/\*=/g).length === 3);
```
不要修改註釋上面的代碼。
```js
assert(
/let a = 5;/.test(code) &&
/let b = 12;/.test(code) &&
/let c = 4\.6;/.test(code)
);
```
# --seed--
## --after-user-code--
```js
(function(a,b,c){ return "a = " + a + ", b = " + b + ", c = " + c; })(a,b,c);
```
## --seed-contents--
```js
let a = 5;
let b = 12;
let c = 4.6;
// Only change code below this line
a = a * 5;
b = 3 * b;
c = c * 10;
```
# --solutions--
```js
let a = 5;
let b = 12;
let c = 4.6;
a *= 5;
b *= 3;
c *= 10;
```