设置元素class

var ElementItem = (function () {
    function ElementItem(el) {
        this.el = el;
    }
    //设置class名
    ElementItem.prototype.addClass = function (className) {
        var classList = this.el.classList;
        if (classList) {
            classList.add(className);
        }
        else {
            //IE7&IE8
            classList = this.el.getAttribute('class') || '';
            classList += ' ' + className;
            this.el.setAttribute('class', classList);
        }
    };
    //移除class名
    ElementItem.prototype.removeClass = function (className) {
        var classList = this.el.classList;
        if (classList) {
            classList.remove(className);
        }
        else {
            //IE7&IE8
            classList = this.el.getAttribute('class') || '';
            classList = classList.replace(className, '');
            this.el.setAttribute('class', classList);
        }
    };
    return ElementItem;
}());

typescript代码：

class ElementItem {
	constructor(public el: HTMLElement) {

	}
	addClass(className: string) {
		let classList: DOMTokenList | string = this.el.classList
		if (classList) {
			classList.add(className)
		} else {
			//IE7&IE8
			classList = this.el.getAttribute('class') || ''
			classList += ' ' + className
			this.el.setAttribute('class', classList)
		}
	}
	removeClass(className: string) {
		let classList: any = this.el.classList
		if (classList) {
			classList.remove(className)
		} else {
			//IE7&IE8
			classList = this.el.getAttribute('class') || ''
			classList = classList.replace(className, '')
			this.el.setAttribute('class', classList)
		}
	}
}