JavaScript 学习

今天没事又来学习JavaScript

i = 123; //10进制: 123
i = 0x123e1; //16进制: 74721
i = 0123; //8进制: 83
i = 123e1;  //1230

var o = {};
o.x = 100;
alert(o["x"]);
我更喜欢把Object当成一个hashtable来使用

对象的直接定义:
var o1 = {x:1, y:2, total:3};
var o2 = {1:1, 2:2, x: "hello"};

数组的直接定义:
var b = [1, true, [1,2], {x:1, y:2}, "Hello"];

怎样把10000写成10,000.00
function NumberToStr(n)
{
  var Num = new Number(n);
  return Num.toLocaleString();
}

利用自定义函数实现表达式求值
function CalcExpress(exp)
{
  var func = new Function("return " + exp + ";");
  return func();
}
alert(CalcExpress("1000 * 90 - 2 ^ 2"));


var a = null;
var b = undefined;
alert(a == b);  //will show true
alert(a === b);  //will show false

navigator.appName  //IE will return Microsoft Internet Explorer
navigator.appVersion

var query = location.search.substring(1);  //Get the substring of the URL following ?
location.hash = "#top"; //Scroll to a named portion of the document


try
{
throw new SyntaxError("Error: Cannot find file.");
}
catch(e)
{
alert(e.message);
}

转载于:https://www.cnblogs.com/Icebird/archive/2006/07/20/JavaScriptStudy.html