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The example in this article describes the JS method of realizing continuous upward scrolling of a single line of text. Share it with everyone for your reference. The specific analysis is as follows:
A few days ago, I helped a friend write a JS effect for a single line of text to scroll upwards uninterruptedly. Now I am sharing it with the webers who need it. Let’s look at the HTML and CSS code first:
CSS:
HTML:
The code is as follows:
var controls={},
values={},
t1=200, /*播放动画的时间*/
t2=2000, /*播放时间间隔*/
si;
controls.rollWrap=$("#roll-wrap");
controls.rollWrapUl=controls.rollWrap.children();
controls.rollWrapLIs=controls.rollWrapUl.children();
values.liNums=controls.rollWrapLIs.length;
values.liHeight=controls.rollWrapLIs.eq(0).height();
values.ulHeight=controls.rollWrap.height();
this.init=function(){
autoPlay();
pausePlay();
}
/*滚动*/
function play(){
controls.rollWrapUl.animate({"margin-top" : "-" values.liHeight}, t1, function(){
$(this).css("margin-top" , "0").children().eq(0).appendTo($(this));
});
}
/*自动滚动*/
function autoPlay(){
/*如果所有li标签的高度和大于.roll-wrap的高度则滚动*/
if(values.liHeight*values.liNums > values.ulHeight){
si=setInterval(function(){
play();
},t2);
}
}
/*鼠标经过ul时暂停滚动*/
function pausePlay(){
controls.rollWrapUl.on({
"mouseenter":function(){
clearInterval(si);
},
"mouseleave":function(){
autoPlay();
}
});
}
}
new scrollTxt().init();
希望本文所述对大家的javascript程序设计有所帮助。