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"use strict"; |
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|
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function main() { |
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|
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var topButton = document.getElementById('topButton-phpinfo-WP'); |
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|
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function showButton() { |
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if (topButton !== null) { |
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if (document.body.scrollTop > 400 || document.documentElement.scrollTop > 400) { |
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topButton.style.display = "block"; |
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} else { |
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topButton.style.display = "none"; |
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} |
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} |
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} |
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|
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window.onscroll = function () { |
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showButton(); |
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}; |
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|
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function goTop() { |
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document.body.scrollTop = 0; |
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document.documentElement.scrollTop = 0; |
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} |
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|
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if (topButton !== null) { |
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topButton.addEventListener('click', goTop); |
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} |
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|
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} |
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|
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main(); |
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