SOURCE

console 命令行工具 X clear 

                    

                        
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console

            
if ("geolocation" in navigator) {
    console.log('ok')
} else {
    console.log('ok')
}

            
<iframe id="inlineFrameExample"
    title="Inline Frame Example"
    width="300"
    height="200"
    src="https://www.openstreetmap.org/export/embed.html?bbox=-0.004017949104309083%2C51.47612752641776%2C0.00030577182769775396%2C51.478569861898606&layer=mapnik">
</iframe>