apple touch icon 大小总结

<!-- For Chrome for Android: -->
<link rel="icon" sizes="192x192" href="touch-icon-192x192.png">
<!-- For iPhone 6 Plus with @3× display: -->
<link rel="apple-touch-icon-precomposed" sizes="180x180" href="apple-touch-icon-180x180-precomposed.png">
<!-- For iPad with @2× display running iOS ≥ 7: -->
<link rel="apple-touch-icon-precomposed" sizes="152x152" href="apple-touch-icon-152x152-precomposed.png">
<!-- For iPad with @2× display running iOS ≤ 6: -->
<link rel="apple-touch-icon-precomposed" sizes="144x144" href="apple-touch-icon-144x144-precomposed.png">
<!-- For iPhone with @2× display running iOS ≥ 7: -->
<link rel="apple-touch-icon-precomposed" sizes="120x120" href="apple-touch-icon-120x120-precomposed.png">
<!-- For iPhone with @2× display running iOS ≤ 6: -->
<link rel="apple-touch-icon-precomposed" sizes="114x114" href="apple-touch-icon-114x114-precomposed.png">
<!-- For the iPad mini and the first- and second-generation iPad (@1× display) on iOS ≥ 7: -->
<link rel="apple-touch-icon-precomposed" sizes="76x76" href="apple-touch-icon-76x76-precomposed.png">
<!-- For the iPad mini and the first- and second-generation iPad (@1× display) on iOS ≤ 6: -->
<link rel="apple-touch-icon-precomposed" sizes="72x72" href="apple-touch-icon-72x72-precomposed.png">
<!-- For non-Retina iPhone, iPod Touch, and Android 2.1+ devices: -->
<link rel="apple-touch-icon-precomposed" href="apple-touch-icon-precomposed.png"><!-- 57×57px -->