通过arguments.call()实现对原函数的递归调用；
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<!-- 随机取1-33之间的6个数字，不可重复，并且按由小到大排序。随机取1-16之间的两个数字，和之前的6个数字组成数组 -->
<input type="button" value="点击生成双色球数组" 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("红色球：" + 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("蓝色球" + 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>