


The example in this article describes how to implement the ladder multiplication table in JavaScript. Share it with everyone for your reference. The details are as follows:
The effect is as shown below:
The table uses table, tr, td in HTML, and then uses the for statement to implement it, looping to output rows and columns, and then performing multiplication according to the number of rows and columns. The first for loop outputs 9 rows, and then a for is embedded. Take the value of the first for loop in the conditional expression and then perform the output table operation. Why should we take the first for loop? Because the number of times of the first for loop is the rule of the ladder arrangement, and the rule of the ladder arrangement is the first row. One square, two squares in the second row, three squares in the third row, and so on.
The complete code is as follows:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> <script type="text/javascript"> var str= "<table border=1 width=500 align=center>"; for(var a=1;a<=9;a++) { str +="<tr>"; for(b=1;b<=a;b++) { str +="<td>"+a+"×"+b+"="+a*b+"</td>"; } str +="</tr>"; } str +="</table>" document.write(str); </script> </head> <body> </body> </html>
I hope this article will be helpful to everyone’s JavaScript programming design.

去掉重复并排序的方法:1、使用“Array.from(new Set(arr))”或者“[…new Set(arr)]”语句,去掉数组中的重复元素,返回去重后的新数组;2、利用sort()对去重数组进行排序,语法“去重数组.sort()”。

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方法:1、利用“点击元素对象.unbind("click");”方法,该方法可以移除被选元素的事件处理程序;2、利用“点击元素对象.off("click");”方法,该方法可以移除通过on()方法添加的事件处理程序。

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foreach不是es6的方法。foreach是es3中一个遍历数组的方法,可以调用数组的每个元素,并将元素传给回调函数进行处理,语法“array.forEach(function(当前元素,索引,数组){...})”;该方法不处理空数组。


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