yun_oyun的博客

<script> function backDay() { var year = prompt('请输入年份'); if (isRunYear(year)) alert('今年为闰年二月份为29天'); else alert('今年为平年二月份为28天'); } function isRunYear(year) { if (year % 4 == 0 &a.

一、转换为字符串 1. 变量.String(); var num = 1; alert(num.toString(num)); 2.String() 强制转换 var num = 1; alert(String(num)); 3.加号拼接字符串 隐式转换 var num = 1; alert(num + '我是字...