举例：http://localhost:5000/?sss=sdf&fdd=123
1, to set or get the entire URL string
window.location.href
值： http://localhost:5000/?sss=sdf&fdd=123
2, set or get the URL protocol part
window.location.protocol
Value: http:
3, set or get the host part of the URL
window.location.host
Value: localhost: 5000
4, set or get the port number associated with the URL
window.location.port
Value: 5000
5, set or get the path portion of the URL (the address is file)
window.location.pathname
value:/
6, a portion or retrieves the href attribute follows the question mark
window.location.search
Value:? Sss = sdf & fdd = 123
7, set or get the segment in the href attribute "#" after a pound sign
window.location.hash
: Empty
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