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js & void() & void(0)

https://www.runoob.com/js/js-void.html

void()

<a href="javascript:void(0)">单击此处什么也不会发生</a>
<a href="javascript:void(alert('Warning!!!'))">点我!</a>

function getValue(){
   var a,b,c;
   a = void( b = 5, c = 7 );
   document.write('a = ' + a + ' b = ' + b +' c = ' + c );
}

// a = undefined b = 5 c = 7

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