js中抖函数的封装

function doMove ( obj, attr, dir, target, endFn ) {

dir = parseInt(getStyle( obj, attr )) < target ? dir : -dir;

clearInterval( obj.timer );

obj.timer = setInterval(function () {

var speed = parseInt(getStyle( obj, attr )) + dir; // 步长

if ( speed > target && dir > 0 || speed < target && dir < 0 ) {
speed = target;
}

obj.style[attr] = speed + 'px';

if ( speed == target ) {
clearInterval( obj.timer );

/*
if ( endFn ) {
endFn();
}
*/
endFn && endFn();

}

}, 30);
}

function getStyle ( obj, attr ) { return obj.currentStyle?obj.currentStyle[attr] : getComputedStyle( obj )[attr]; }

待……