The solution is as follows:
Add the code under the head tag as follows:
1 <link rel="shortcut icon" href="your_ico.ico" type="image/x-icon"> 2 <link rel="icon" href="your_ico.ico" type="image/x-icon">
The first line is required, the second line is not, possibly for compatibility.
href is the icon path, type specifies the type, you can choose several types under mime, and pay attention to the size of the icon, usually 16×16, 32×32.
PS: For comparison, under firefox, only the icon appears in the title bar, and both the title bar and address bar under ie have icons.