通過arguments.call()實現對原函數的遞歸調用；
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<!-- 隨機取1-33之間的6個數字，不可重復，並且按由小到大排序。隨機取1-16之間的兩個數字，和之前的6個數字組成數組 -->
<input type="button" value="點擊生成雙色球數組" id="btn">
<p id="numArr"></p>
<script>
function getNumArr() {
var arr_red = [];
function getRandomNum_red() {
var randomNumRed = Math.floor(Math.random() * 33) + 1;
if (arr_red.indexOf(randomNumRed) == -1) {
arr_red.push(randomNumRed);
} else {
arguments.callee();
}
}
for (let i = 0; i < 6; i++) {
getRandomNum_red();
}
console.log("紅色球：" + arr_red);
var arr_blue = [];
function getRandomNum_blue() {
var randomNumBlue = Math.floor(Math.random() * 16) + 1;
if (arr_blue.indexOf(randomNumBlue) == -1) {
arr_blue.push(randomNumBlue);
} else {
arguments.callee();
}
}
for (let i = 0; i < 2; i++) {
getRandomNum_blue();
}
console.log("藍色球" + arr_blue);
arr_red = arr_red.sort(function (a, b) {
return a - b;
});
arr_blue = arr_blue.sort(function (a, b) {
return a - b;
});
document.getElementById("numArr").innerHTML = `<span style='color:red;'>${arr_red.toString()},</span><span style='color:blue;'>${arr_blue.toString()}</span>`;
}
document.getElementById("btn").addEventListener("click", getNumArr, false);
</script>
</body>
</html>