The Number parseInt() method Mar 18, 2019 The Number parseFloat() method Mar 17, 2019 The Number isSafeInteger() method Mar 16, 2019 The Number isNaN() method Mar 15, 2019 The Number isInteger() method Mar 14, 2019 JavaScript Reference: String Mar 13, 2019 The String valueOf...
举个例子,假设我们有一个正方形div,宽度为100px, 现在想让它的宽度在1000毫秒内增加到300px——很简单,算出每毫秒内应该增加的像素,再按每毫秒为周期调用setInterval实现增长 vardiv=$('div')[0];varwidth=parseInt(div.style.width,10);varMAX=300,duration=1000;varinc=parseFloat((MAX-width)/duration);fu...