alert(parseInt("101101", 2))
运行代码
function toBin(intNum) {
var answer = "";
if(/\d+/.test(intNum)) {
while(intNum != 0) {
answer = Math.abs(intNum%2)+answer;
intNum = parseInt(intNum/2);
}
if(answer.length == 0)
answer = "0";
return answer;
} else {
return 0;
}
}
alert(toBin(45))
运行代码
function toBin(dec) {
var bits = [];
var dividend = dec;
var remainder = 0;
while (dividend >= 2) {
remainder = dividend % 2;
bits.push(remainder);
dividend = (dividend - remainder) / 2;
}
bits.push(dividend);
bits.reverse();
return bits.join("");
}
alert(toBin(45))
运行代码
<html>
<head>
<title></title>
<script language="javascript">
var arr=new Array();
arr[0]=3.5;
arr[1]=300;
arr[2]=50;//换成30
arr[3]=1.5;//换成40 之后就OK排序就是升序的
arr[4]=400;
arr.sort();//这个排序出来怎么不是升序的
for(var i=0;i<arr.length;i++)
{
do ......
1. oncontextmenu="window.event.returnValue=false" 将彻底屏蔽鼠标右键
<table border oncontextmenu=return(false)><td>no</table> 可用于Table
2. <body onselectstart="return false"> 取消选取、防止复制
3. onpaste="return false" 不准粘贴
4. oncopy="return false;" oncut="re ......
