#JavaScript (ES6) + HTML, 77 bytes
f=(c=0)=>setTimeout(f,250,-~c%4,o.innerText="Loading... "+"|/-\\"[c])
<p id=o>
##Try It
(f=(c=0)=>setTimeout(f,250,-~c%4,o.innerText="Loading... "+"|/-\\"[c]))()<p id=o>
Shaggy
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