原生JS实现LOADING效果_javascript技巧

function loading(element,lightColor,darkColor,speed,callback){

if(!element&&(!element.innerText||!element.textContent))return

element = typeof element==="string"?document.getElementById(element):element

lightColor = lightColor||"#fff",darkColor = darkColor||"#000",speed = speed||300

var arr_spanEles = new Array()

!function(arr_elementText){

element.innerText=element.textContent=""

for(var i=0;i
var span = document.createElement("span")

element.innerText?span.innerText = arr_elementText[i]:span.textContent = arr_elementText[i]

element.appendChild(span)

arr_spanEles.push(span)

}

}((element.innerText||element.textContent).split(""))

var index = -1,length = arr_spanEles.length

var loadingTimer = setInterval(function(){

arr_spanEles[Math.max(index,0)].style.color = darkColor

if(index == length-1){

index = -1

callback&&callback()

}

++index

arr_spanEles[index].style.color = lightColor

},speed)

}