鼠标滑过时的显示：
当评价完成后，关闭浏览器重新打开页面，还是上次的评价结果。用cookie实现。
具体实现如下：
import componenet from "./component.js";
export default class stars extends componenet {
label;
stars_num = 5;
stararr = [];
score = 0;
starscon;
faceicon;
scorecon;
index = -1;
name;
static stars_list={}; //存储当前页面中所有的五星评价结果，一个商品为一组。用商品的id作为key，用商品评价组成一个数组，作为value。
date=new date();
constructor(_label,_name) {
super("div");
this.name=_name;
this.label = _label;
object.assign(this.elem.style, {
width:"200px",
height: "16px",
float: "left",
marginright: "20px",
marginbottom: "10px",
fontsize: "12px",
color: "#666",
lineheight: "16px",
userselect: "none",
position: "relative",
top: "20px",
left: "20px",
})
// 解析cookie中存储的评论结果并在创建每个评论时初始化score的值。
this.initscore();
// 创建评价标签部分
this.createlabel();
// 创建星星部分
this.createstars();
// 创建分数部分
this.createscore();
// 初始化星星样式。
this.changestarstyle(this.score-1);
// 初始化分数
this.changescore(this.score);
// 添加鼠标滑过点击事件。
this.starscon.addeventlistener("mouseenter", e => this.mousehandler(e));
this.starscon.addeventlistener("mouseleave", e => this.mousehandler(e));
this.starscon.addeventlistener("mouseover", e => this.mousehandler(e));
this.starscon.addeventlistener("click", e => this.clickhandler(e));
this.date.setfullyear(2021);
}
appendto(_parent){
super.appendto(_parent);
if(!stars.stars_list[this.name]) stars.stars_list[this.name]=[];
stars.stars_list[this.name].push(this.label+"="+this.score);
}
clickhandler(e){
if(e.target.constructor!==htmllielement) return
this.index = this.stararr.indexof(e.target);
this.score = this.index+1;
this.changestarstyle(this.index);
this.changescore(this.index+1);
// 每次点击都将评论的结果存储到cookie中，以便下次打开页面时读取。stars_list中存储的是label作为key，score作为value的数据。
this.storagescore();
}
storagescore(){
for(let prop in stars.stars_list){
if(prop === this.name){
stars.stars_list[prop].foreach((item,index)=>{
if(item.includes(this.label)) stars.stars_list[prop][index] = this.label+"="+this.score;
});
}
}
document.cookie="comment="+ json.stringify(stars.stars_list)+";expires="+this.date.toutcstring();
}
mousehandler(e) {
switch (e.type) {
case "mouseenter":
this.faceicon.style.display = "block";
break;
case "mouseleave":
this.faceicon.style.display = "none";
this.changestarstyle(this.index);
this.changescore(this.score);
break;
case "mouseover":
let index = this.stararr.indexof(e.target);
this.changestarstyle(index);
this.changescore(index + 1);
this.changefacestyle(index);
break;
}
}
changestarstyle(_i) {
for (let n = 0; n < this.stararr.length; n++) {
if (n <= _i || n < this.score) {
this.stararr[n].style.backgroundpositiony = "-16px";
} else {
this.stararr[n].style.backgroundpositiony = "0px";
}
}
}
changefacestyle(_i) {
this.faceicon.style.left = _i * 16 + "px";
this.faceicon.style.backgroundpositionx = (_i + 1) * 20 + "px";
}
changescore(_i) {
this.scorecon.textcontent = _i + "分";
}
createlabel() {
let label = document.createelement("span");
object.assign(label.style, {
float: "left",
padding: "0 5px",
})
label.textcontent = this.label;
this.elem.appendchild(label);
}
createstars() {
this.starscon = document.createelement("ul");
object.assign(this.starscon.style, {
margin: 0,
padding: 0,
liststyle: "none",
width: "80px",
height: "16px",
float: "left",
position: "relative",
})
for (let i = 0; i < this.stars_num; i++) {
let li = document.createelement("li");
object.assign(li.style, {
width: "16px",
height: "16px",
float: "left",
backgroundimage: "url(./star_img/commstar.png)",
})
this.stararr.push(li);
this.starscon.appendchild(li);
}
this.faceicon = document.createelement("div");
object.assign(this.faceicon.style, {
width: "16px",
height: "16px",
backgroundimage: "url(./star_img/face-red.png)",
backgroundpositionx: "-80px",
position: "absolute",
left: "0",
top: "-16px",
display: "none",
})
this.starscon.appendchild(this.faceicon);
this.elem.appendchild(this.starscon);
}
createscore() {
this.scorecon = document.createelement("div");
object.assign(this.scorecon.style, {
height: "16px",
width:"20px",
float: "left",
padding: "0 5px",
})
this.scorecon.textcontent = this.score + "分",
this.elem.appendchild(this.scorecon);
}
initscore(){
// 直接读取cookie显示如下
// comment={"1001":["商品符合度=5","店家服务态度=0","快递配送速度=0","快递员服务=0","快递包装=0"],"1002":["商品符合度=0","店家服务态度=0","快递配送速度=0","快递员服务=0","快递包装=0"]}
// 解析cookie中存储的评论结果。
if(!document.cookie.includes("comment=")) return
let o = json.parse(document.cookie.match(/(\{.*?\})/)[1]);
if(!o) return
// 解析后的o如下
// ["商品符合度=1", "店家服务态度=0", "快递配送速度=0", "快递员服务=0", "快递包装=0"]
for(let prop in o){
if(this.name===prop){
this.score=o[prop].reduce((value,item,index)=>{
let arr=item.split("=");
if(arr[0].includes(this.label)) value=parseint(arr[1]);
return value;
},0)
}
}
}
}
使用时传入标签，新建实例。
import stars from './js/stars.js';
let list=["商品符合度","店家服务态度","快递配送速度","快递员服务","快递包装"];
// let star = new stars(list[0]);
// star.appendto("body");
list.foreach(item=>{
// 传入标签和对应的商品id
let star = new stars(item,"1001");
star.appendto(".div1");
})
list.foreach(item=>{
let star = new stars(item,"1002");
star.appendto(".div2");
})
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
