简单赋值：=
复合赋值：+=、-=、*=、/=、%=
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>赋值操作符</title>
</head>
<body>
<script>
var a=10,
b=20,
str="hello";
a+=5; //a=a+5
b%=4; //b=b%4
str+=" world"; //str=str+" world"
console.log(a);
console.log(b);
console.log(str);
</script>
</body>
</html>
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