一. 从0~9十个数字中随机选出5个数

function randomFive(){var arr = [0,1,2,3,4,5,6,7,8,9];var out = [];var num = 5;while(out.length < num){var temp = (Math.random()*arr.length) >> 0;out.push(arr.splice(temp,1));}return out}

二. JS去掉字符串前后空格或去掉所有空格的用法

1. 去掉前后空格

function Trim(str){ return str.replace(/(^\s*)|(\s*$)/g, ""); 
}

2.去掉中间空格

 function Trim(str,is_global){var result;result = str.replace(/(^\s+)|(\s+$)/g,"");if(is_global.toLowerCase()=="g"){result = result.replace(/\s/g,"");}return result;