encodeURI(a):
http://www.sohu.com/index.jsp?name=%E5%95%8A%E5%95%8A&page=d_s&id=3%2033%20333%203
encodeURIComponent(a):
http%3A%2F%2Fwww.sohu.com%2Findex.jsp%3Fname%3D%E5%95%8A%E5%95%8A%26page%3Dd_s%26id%3D3%2033%20333%203
escape(a):
http%3A//www.sohu.com/index.jsp%3Fname%3D%u554A%u554A%26page%3Dd_s%26id%3D3%2033%20333%203
Hello, China!encodeURI(b):
Hello,%20China!
encodeURIComponent(b):
Hello%2C%20China!
escape(b):
Hello%2C%20China%21
escape()编码,不能编码URI unescape()解码,不能编码URI 
encodeURIComponent()编码范围比encodeURI大些 decodeURIComponent()解码范围比encodeURI大些 
encodeURI()对一个URI编码 decodeURI()对一个URI解码 
isFininte()检测表达式的值,如果不是无穷大或NaN则为True isNaN()判断是否NaN 
confirm()确认取消对话框 prompt()带输入信息的对话框 
paraseFloat()转换成小数 paraseInt()转换成整数