To add a radius control to the page, add a tag to the page with options for each of the radius values that you want to support.

要为页面添加半径控制，为页面添加一个标签，该标签对您想要支持的每个半径值都提供选项。

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In Listing 5, the changes start right at the top of the page where you add a change listener to the radius control.

在清单5中，更改刚好起始于页面的顶部，这里为半径控制添加一个更改侦听器。

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The HTML section of the page is also updated to add the tag and the radius options.

页面的 HTML 部分也得到更新以添加 标签和半径选项。

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The report's authors add that the widening of the motorway should only go ahead if tolls are introduced within a 50-mile radius of London.

BBC: Tolls 'would curb M25 traffic jams'