decrease_time = setInterval(decrease_opacity_val,10); function decrease_opacity_val(){ showID.style.opacity = showID.style.opacity - 0.01; if(showID.style.opacity == 0) { clearInterval(decrease_time); showID.style.display = "none"; showID.style.opacity = ""; leftID.style.display = "block"; leftID.style.opacity = 0; increase_time = setInterval(increase_opacity_val,10); } } function increase_opacity_val(){ //加加需要使用parseFloat转换 leftID.style.opacity = parseFloat(leftID.style.opacity) + 0.01; if(leftID.style.opacity == 1) { clearInterval(increase_time); leftID.style.opacity = ""; } }
setInterval对某个数值加加渐减
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转载自chiangfai.iteye.com/blog/2287085
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