正確函數(shù)：function addClass(element,value) { if(!element.className) {
element.className = value;
} else {
newClassName = element.className;
newClassName += " ";
newClassName += value;
element.className = newClassName;
}
}寫成這樣可以嗎？function addClass(element,value) { if(!element.className) {
element.className = value;
} else {
newClassName += " ";
newClassName += value;
}
newClassName = element.className前后換了位置又是什么意思呢？
精慕HU
2018-11-22 18:14:28
