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javaScript實現滾動條事件

//滾動事件 function myScroll() { var i = document.body.scrollTop; var top = document.getElementById("top"); var left = document.getElementById("left"); var f1 = document.getElementById("f1"); var f2 = document.getElementById("f2"
); var f3 = document.getElementById("f3"); var f4 = document.getElementById("f4"); var f5 = document.getElementById("f5"); var f6 = document.getElementById("f6"); //控制頂部 if(i >= 1000) { top.style.display = "block"
; top.innerHTML = i; } else { top.style.display = "none"; } //控制左側 if(i >= 2000) { left.style.display = "block"; } else { left.style.display = "none"
; } //顯示樓層 if(i >= 2000 && i <= 2500) { f1.className = "a"; f2.className = ""; f3.className = ""; f4.className = ""; f5.className = ""; f6.className = ""; } else if(i > 2500 && i <= 3000) { f1.className = ""; f2.className = "a"; f3.className = ""; f4.className = ""; f5.className = ""; f6.className = ""; } else if(i > 3000 && i <= 3500) { f1.className = ""; f2.className = ""; f3.className = "a"; f4.className = ""; f5.className = ""; f6.className = ""; } else if(i > 3500 && i <= 4000) { f1.className = ""; f2.className = ""; f3.className = ""; f4.className = "a"; f5.className = ""; f6.className = ""; } else if(i > 4000 && i <= 4500) { f1.className = ""; f2.className = ""; f3.className = ""; f4.className = ""; f5.className = "a"; f6.className = ""; } else if(i > 4500 && i <= 5000) { f1.className = ""; f2.className = ""; f3.className = ""; f4.className = ""; f5.className = ""; f6.className = "a"; } }