Javascript绝句欣赏
转自（http://site.douban.com/widget/notes/22456/note/142716442/）
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1. 取整同时转成数值型：'10.567890'|0结果: 10'10.567890'^0结果: 10-2.23456789|0结果: -2~~-2.23456789结果: -22. 日期转数值：var d = +new Date(); //12956984167923. 类数组对象转数组：var arr = [].slice.call(arguments)4. 漂亮的随机码：Math.random().toString(16).substring(2); //14位Math.random().toString(36).substring(2); //11位5. 合并数组：var a = [1,2,3];var b = [4,5,6];Array.prototype.push.apply(a, b);uneval(a); //[1,2,3,4,5,6]6. 用0补全位数：function prefixInteger(num, length) { return (num / Math.pow(10, length)).toFixed(length).substr(2);}7. 交换值：a= [b, b=a][0];8. 将一个数组插入另一个数组的指定位置：var a = [1,2,3,7,8,9];var b = [4,5,6];var insertIndex = 3;a.splice.apply(a, Array.concat(insertIndex, 0, b));// a: 1,2,3,4,5,6,7,8,99. 删除数组元素：var a = [1,2,3,4,5];a.splice(3,1);10. 快速取数组最大和最小值Math.max.apply(Math, [1,2,3]) //3Math.min.apply(Math, [1,2,3]) //1(出自http://ejohn.org/blog/fast-javascript-maxmin/)11. 条件判断：var a = b && 1; 相当于if (b) { a = 1}var a = b || 1; 相当于if (b) { a = b;} else { a = 1;}12. 判断IE:var ie = /*@cc_on !@*/false;还有吗？欢迎回应?