页面历史

function main(spreadsheetReport) {
    var elems = spreadsheetReport.elemSheetFrame.contentWindow.document.getElementsByTagName("A");
	var oldElem="";  //用于存放上一次点击链接的对象
    for (var i = 0; i < elems.length; i++) {
        var elem = elems[i];
        // 设置点击跳转前的字体颜色和下划线
        //设置字体颜色
        elem.firstChild.style.color = "#ffff00";
        //设置下划线颜色
        elem.style.color = "#ffff00";
        //隐藏下划线
		elem.style.textDecoration = "none";
        if (elem.firstElementChild) {
            elem.firstElementChild.style.textDecoration = "none";
        }
        if (elem.parentElement) {
            elem.parentElement.style.textDecoration = "none";
        }
        // 设置点击跳转后的字体颜色和下划线
        elem.onclick = function() {
            this.firstChild.style.color = "#fff00";
            this.style.color = "#0000ff";
            
			//判断上一次点击的是哪个链接，如果上一次有点击，则先将上一次的取消，然后再设置本次点击的背景色，然后再将本次的点击对象作为旧的对象，以便下一次的判断
            if(oldElem){
                oldElem.style.backgroundColor = "";
                this.style.backgroundColor = "#ff0000";
                oldElem=this;
            }
			//如果上一次没有点击任何链接，本次是第一次点击
            else{
                this.style.backgroundColor = "#ff0000";
                oldElem=this;
            }
            // this.style.textDecoration = "none";
        };
        // 鼠标移入时设置单元格背景色
        var c = elem.parentNode;
        spreadsheetReport.addListener(c, "mouseover",
        function() {
            this.style.backgroundColor = "#ff0000";
        },
        c);
        // 鼠标离开时设置单元格背景色
        spreadsheetReport.addListener(c, "mouseout",
        function() {
            this.style.backgroundColor = "#ffffff";
        },
        c);
    }
}