资源名称：Learn Javaｓｃｒｉｐｔ and Ajax with w3Schools 英文pdf
What Javaｓｃｒｉｐｔ is and isn’t
How to put Javaｓｃｒｉｐｔ into an HTML page
Javaｓｃｒｉｐｔ special characters and guidelines
How to use Javaｓｃｒｉｐｔ operators
If… else statements and do… while loops
All about Javaｓｃｒｉｐｔ objects
How to use Ajax properties
What the Ajax XMLHttpRequest Object does
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