Randomly obtain 10 different random numbers between 1-20
<span style="color: #0000ff;"><!</span><span style="color: #ff00ff;">DOCTYPE html</span><span style="color: #0000ff;">></span>
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<span style="color: #0000ff;"><</span><span style="color: #800000;">meta </span><span style="color: #ff0000;">charset</span><span style="color: #0000ff;">="UTF-8"</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"><</span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>10个随机数不相同<span style="color: #0000ff;"></</span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"></</span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span>
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<span style="color: #0000ff;"><</span><span style="color: #800000;">h1 </span><span style="color: #ff0000;">id</span><span style="color: #0000ff;">="con"</span><span style="color: #0000ff;">></</span><span style="color: #800000;">h1</span><span style="color: #0000ff;">></span>
<span style="color: #0000ff;"><</span><span style="color: #800000;">script</span><span style="color: #0000ff;">></span>
<span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> con</span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;">document.getElementById(</span><span style="background-color: #f5f5f5; color: #000000;">'</span><span style="background-color: #f5f5f5; color: #000000;">con</span><span style="background-color: #f5f5f5; color: #000000;">'</span><span style="background-color: #f5f5f5; color: #000000;">);
</span><span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> arr</span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;">[];</span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;">第一种方法</span>
<span style="background-color: #f5f5f5; color: #0000ff;">for</span><span style="background-color: #f5f5f5; color: #000000;"> (</span><span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> i </span><span style="background-color: #f5f5f5; color: #000000;">=</span> <span style="background-color: #f5f5f5; color: #000000;">0</span><span style="background-color: #f5f5f5; color: #000000;">; i </span><span style="background-color: #f5f5f5; color: #000000;"><</span> <span style="background-color: #f5f5f5; color: #000000;">10</span><span style="background-color: #f5f5f5; color: #000000;">; i</span><span style="background-color: #f5f5f5; color: #000000;">++</span><span style="background-color: #f5f5f5; color: #000000;">) {
</span><span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> x</span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;">parseInt(Math.random()</span><span style="background-color: #f5f5f5; color: #000000;">*</span><span style="background-color: #f5f5f5; color: #000000;">20</span><span style="background-color: #f5f5f5; color: #000000;">+</span><span style="background-color: #f5f5f5; color: #000000;">1</span><span style="background-color: #f5f5f5; color: #000000;">);
</span><span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> same</span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #0000ff;">false</span><span style="background-color: #f5f5f5; color: #000000;">;//判断是否有相同的数字
</span><span style="background-color: #f5f5f5; color: #0000ff;">for</span><span style="background-color: #f5f5f5; color: #000000;"> (</span><span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> i </span><span style="background-color: #f5f5f5; color: #000000;">=</span> <span style="background-color: #f5f5f5; color: #000000;">0</span><span style="background-color: #f5f5f5; color: #000000;">; i </span><span style="background-color: #f5f5f5; color: #000000;"><</span><span style="background-color: #f5f5f5; color: #000000;"> arr.length; i</span><span style="background-color: #f5f5f5; color: #000000;">++</span><span style="background-color: #f5f5f5; color: #000000;">) {
</span><span style="background-color: #f5f5f5; color: #0000ff;">if</span><span style="background-color: #f5f5f5; color: #000000;"> (arr[i]</span><span style="background-color: #f5f5f5; color: #000000;">==</span><span style="background-color: #f5f5f5; color: #000000;">x) {
same</span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #0000ff;">true</span><span style="background-color: #f5f5f5; color: #000000;">;
i</span><span style="background-color: #f5f5f5; color: #000000;">--</span><span style="background-color: #f5f5f5; color: #000000;">;
</span><span style="background-color: #f5f5f5; color: #0000ff;">break</span><span style="background-color: #f5f5f5; color: #000000;">;
}
}
</span><span style="background-color: #f5f5f5; color: #0000ff;">if</span><span style="background-color: #f5f5f5; color: #000000;"> (same</span><span style="background-color: #f5f5f5; color: #000000;">==</span><span style="background-color: #f5f5f5; color: #0000ff;">false</span><span style="background-color: #f5f5f5; color: #000000;">) {
arr.push(x);
}
}
</span><span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> arr </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> (</span><span style="background-color: #f5f5f5; color: #0000ff;">function</span><span style="background-color: #f5f5f5; color: #000000;">(){</span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;">第二种方法</span>
<span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> _arr </span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;"> [];
</span><span style="background-color: #f5f5f5; color: #0000ff;">for</span><span style="background-color: #f5f5f5; color: #000000;">(</span><span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> i</span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;">1</span><span style="background-color: #f5f5f5; color: #000000;">;i</span><span style="background-color: #f5f5f5; color: #000000;"><=</span><span style="background-color: #f5f5f5; color: #000000;">20</span><span style="background-color: #f5f5f5; color: #000000;">;i</span><span style="background-color: #f5f5f5; color: #000000;">++</span><span style="background-color: #f5f5f5; color: #000000;">){
_arr.push(i);
}
</span><span style="background-color: #f5f5f5; color: #0000ff;">return</span><span style="background-color: #f5f5f5; color: #000000;"> _arr;
})().sort(</span><span style="background-color: #f5f5f5; color: #0000ff;">function</span><span style="background-color: #f5f5f5; color: #000000;">(a,b){
</span><span style="background-color: #f5f5f5; color: #0000ff;">return</span><span style="background-color: #f5f5f5; color: #000000;"> Math.random()</span><span style="background-color: #f5f5f5; color: #000000;">-</span><span style="background-color: #f5f5f5; color: #000000;">0.5</span><span style="background-color: #f5f5f5; color: #000000;">;//随机排序
}).slice(</span><span style="background-color: #f5f5f5; color: #000000;">0</span><span style="background-color: #f5f5f5; color: #000000;">,</span><span style="background-color: #f5f5f5; color: #000000;">10</span><span style="background-color: #f5f5f5; color: #000000;">);//截取前10个数字；
con.innerHTML</span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;">arr;<br /><br />
//下面是我家的小可爱写的，佩服她的脑洞；
</span><span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> arr</span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;">[parseInt(Math.random()</span><span style="background-color: #f5f5f5; color: #000000;">*</span><span style="background-color: #f5f5f5; color: #000000;">20</span><span style="background-color: #f5f5f5; color: #000000;">)</span><span style="background-color: #f5f5f5; color: #000000;">+</span><span style="background-color: #f5f5f5; color: #000000;">1</span><span style="background-color: #f5f5f5; color: #000000;">];</span><span style="background-color: #f5f5f5; color: #008000;">//</span><span style="background-color: #f5f5f5; color: #008000;">给数组第一个数取一个随机数</span>
<span style="background-color: #f5f5f5; color: #0000ff;">for</span><span style="background-color: #f5f5f5; color: #000000;"> (</span><span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> i </span><span style="background-color: #f5f5f5; color: #000000;">=</span> <span style="background-color: #f5f5f5; color: #000000;">1</span><span style="background-color: #f5f5f5; color: #000000;">; i </span><span style="background-color: #f5f5f5; color: #000000;"><</span> <span style="background-color: #f5f5f5; color: #000000;">10</span><span style="background-color: #f5f5f5; color: #000000;">; i</span><span style="background-color: #f5f5f5; color: #000000;">++</span><span style="background-color: #f5f5f5; color: #000000;">) {
</span><span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> r</span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;">parseInt(Math.random()</span><span style="background-color: #f5f5f5; color: #000000;">*</span><span style="background-color: #f5f5f5; color: #000000;">20</span><span style="background-color: #f5f5f5; color: #000000;">)</span><span style="background-color: #f5f5f5; color: #000000;">+</span><span style="background-color: #f5f5f5; color: #000000;">1</span><span style="background-color: #f5f5f5; color: #000000;">;
arr.push(r);//先插入数组
console.log(arr);
</span><span style="background-color: #f5f5f5; color: #0000ff;">for</span><span style="background-color: #f5f5f5; color: #000000;"> (</span><span style="background-color: #f5f5f5; color: #0000ff;">var</span><span style="background-color: #f5f5f5; color: #000000;"> j </span><span style="background-color: #f5f5f5; color: #000000;">=</span> <span style="background-color: #f5f5f5; color: #000000;">0</span><span style="background-color: #f5f5f5; color: #000000;">; j </span><span style="background-color: #f5f5f5; color: #000000;"><</span><span style="background-color: #f5f5f5; color: #000000;"> i; j</span><span style="background-color: #f5f5f5; color: #000000;">++</span><span style="background-color: #f5f5f5; color: #000000;">) {
</span><span style="background-color: #f5f5f5; color: #0000ff;">if</span><span style="background-color: #f5f5f5; color: #000000;"> (arr[j]</span><span style="background-color: #f5f5f5; color: #000000;">==</span><span style="background-color: #f5f5f5; color: #000000;">r) {//若有相同的就把新插入的树删除，再接着循环
arr.pop();
i</span><span style="background-color: #f5f5f5; color: #000000;">--</span><span style="background-color: #f5f5f5; color: #000000;">;
</span><span style="background-color: #f5f5f5; color: #0000ff;">break</span><span style="background-color: #f5f5f5; color: #000000;">;
}
}
}
con.innerHTML</span><span style="background-color: #f5f5f5; color: #000000;">=</span><span style="background-color: #f5f5f5; color: #000000;">arr;
</span><span style="color: #0000ff;"></</span><span style="color: #800000;">script</span><span style="color: #0000ff;">></span>
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