Compile two JS Code compiling methods for IE

Sometimes we need to write separate JS processing for the compatibility of some IE. Code. There are multiple approaches:

1. Check navigation. useragent to determine whether it is IE, and then write the processing code of the IE Branch:
2. by declaring the @ cc_on statement, you can enable Conditional compilation in the comments of the script so that non-ie browsers will recognize it as comments and ignore it (measurement, this method will apply to the IE6-9 !) :Copy codeThe Code is as follows:/* @ cc_on @ if (@ _ JScript)
Alert ("Hello World ");
@ End @*/