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<html><head><meta charset="utf-8" /><title></title><style type="text/css">#f {font-size: 50px;font-family: 幼圆;}#btn {width: 50px;height: 30px;opacity: 0.5;background-color: palegoldenrod;}#btn:hover {background-color: burlywood;opacity: 1;}.fonts {line-height: 200px;float: right;font-family: 幼圆;font-size: 20px;}.fontss {line-height: 200px;font-size: 30px;text-align: center;font-family: 幼圆;}.fontsss {line-height: 200px;font-size: 30px;font-family: 幼圆;}.trs:hover {background-color: steelblue;}.a {float: left;text-align: center;line-height: 20px;}#wind {width: 100px;height: 50px;}#last-delete {width: 60px;height: 40px;}#num {color: red;}#main-num {color: red;}.delete-btn:hover {background-color: brown;}.divbtn {width: 25px;height: 17px;background-color: lightsteelblue;}.minus {font-weight: bold;font-size: 12px;text-align: center;}.add {font-weight: bold;font-size: 12px;text-align: cente}#wind:hover {background-color: seagreen;}.delete-btn {height: 100px;width: 90px;opacity: 1;}.td {position: relative;}.foodsbtn {background-color: lightsteelblue;}#aaa {font-size: 60px;font-family: 幼圆;text-align: center;}</style>
</head><body bgcolor="#B0C4DE"><button id="btn">返回</button><center><div id="as"><p id="aaa">◾购物车◾</p></div><div id="fater"><table border="1"><tr bgcolor="steelblue"><th><input type="checkbox" class="checkall">全选</th><th width="600 px" height="30px">商品</th><th width="200px" height="30px">单价</th><th width="250px" height="30px">数量</th><th width="100px" height="30px">小计</th><th width="100px" height="30px">操作</th><tr class="trs"><td><input type="checkbox" class=" foodsbtn"></td><td width="600px" height="260px" valign="center "><img src="img/伍六七.png" width="400px" height=100%><p class="fonts">特价伍六七</p></td><td width="200px" height="260px"><p class="fontss">99</p></td><td width="250px" height="260px"><center><span class="minus" style="cursor:pointer">➖</span><input type="text" class="divbtn" value="1" /><span class="add" style="cursor:pointer" value="1">➕</span></center></td><td width="100px" height="260px"><p class="fontsss">0</p></td><td width="100px" height="260px"><p class="fontsss"><button class="delete-btn">删除</button></p></td></tr><tr class="trs"><td><input type="checkbox" class="foodsbtn"></td><td width="600px" height="260px"><img src="img/姜主任.png" width="400px" height=100%><p class="fonts">新品姜主任</p></td><td width="200px" height="260px"><p class="fontss">599</p></td><td width="250px" height="260px"><center><span class="minus" style="cursor:pointer">➖</span><input type="text" class="divbtn" value="1" /><span class="add" style="cursor:pointer">➕</span></center></td><td width="100px" height="260px"><p class="fontsss">0</p></td><td width="100px" height="260px"><p class="fontsss"><button class="delete-btn">删除</button></p></td></tr><tr class="trs"><td><input type="checkbox" class="foodsbtn"></td><td width="600px" height="260px"><img src="img/梅花十三1.png" width="400px" height=100%><p class="fonts">特价梅花十三</p></td><td width="200px" height="260px"><p class="fontss">199</p></td><td width="250px" height="260px"><center><span class="minus" style="cursor:pointer">➖</span><input type="text" class="divbtn" value="1" /><span class="add" style="cursor:pointer">➕</span></center></td><td width="100px" height="260px"><p class="fontsss">0</p></td><td width="100px" height="260px"><p class="fontsss"><button class="delete-btn">删除</button></p></td></tr><tr class="trs"><td><input type="checkbox" class="foodsbtn"></td><td width="600px" height="260px"><img src="img/梅花十三2.png" width="400px" height=100%><p class="fonts">正品梅花十三</p></td><td width="200px" height="260px"><p class="fontss">699</p></td><td width="250px" height="260px"><center><span class="minus" style="cursor:pointer">➖</span><input type="text" class="divbtn" value="1" /><span class="add" style="cursor:pointer"> ➕</span></center></td><td width="100px" height="260px"><p class="fontsss">0</p></td><td width="100px" height="260px"><p class="fontsss"><button class="delete-btn">删除</button></p></td></tr><table><tr bgcolor="steelblue"><th width="10px" height="50px"><input type="checkbox" class="checkall"></th><th width="50x" height="50px"><p id="a">全选</p></th><th width="850px" height="20px"><button id="last-delete4">删除</button></th><th width="200px" height="50px">已选商品<span id="num">0</span>件<button id="other"></button></th><th width="100px" height="50px">合计:<span id="main-num">0</span>元</th><th width="100px" height="50px"><button id="wind">结算</button></th></tr></table></table></div></center><script type="text/javascript">//全选var checkall = document.querySelectorAll(".checkall");var foodsbtn = document.querySelectorAll(".foodsbtn");//首先历遍两次for循环，第一次i=1是对各全选第二次i=2是第二个全选，然后判断input的状态（onchange函数的意思是改变input是所触发大的函数。点击input也是改变input）//如果点击input执行函数，经历第一次历遍foodsbtn长度的函数，定义每一个单选按钮，让他们的的单击状态跟这个按钮一样，就是定义onchange的按钮（也就是最外层的函数）//在经历第二次历遍，历遍的是两个全选按钮，让这两个按钮的点击状态跟最外层函数的点击状态一样//判断点击状态，开始经历两次for函数的历遍第一次是全部单选按钮跟最外层的函数点击状态一样，第一次历遍是历遍两个全选按钮，让他跟这个按钮的点击状态一样for (var i = 0; i < checkall.length; i++) {checkall[i].onchange = //this指的是这个function() {for (var i = 0; i < foodsbtn.length; i++) {foodsbtn[i].checked = this.checked;}for (var i = 0; i < checkall.length; i++) {checkall[i].checked = this.checked; //this指的是 }totalprice(); //？？？？？？？？？？？？？？？？？？？？？ }}//设置每个按钮的事件，上面的是设置全选按钮的事件//设置每个单选按钮是否全部选中，全部选中触发全选按钮for (var i = 0; i < foodsbtn.length; i++) {foodsbtn[i].onchange = function() { //给每个按钮分发点击事件，点击每个按钮的时候都要判断一下sum是否等于foodbtn。lengthvar sum = 0;for (var i = 0; i < foodsbtn.length; i++) { //判断单选按钮的点击次数if (foodsbtn[i].checked) {sum++;}}for (var i = 0; i < checkall.length; i++) {checkall[i].checked = sum == foodsbtn.length; //判断单选按钮的点击个数是否等于foodbtn。length}totalprice() //当每个单选按钮点击的时候计算总价和总件数}}//计算总价的函数。这里会多次运用这个函数，随意把他封装起来var num = document.querySelector("#num")var divbtn = document.querySelectorAll(".divbtn");var fontss = document.querySelectorAll(".fontss");var main = document.querySelector("#main-num");function totalprice() {var sum = 0;var piece = 0;for (var i = 0; i < foodsbtn.length; i++) {if (foodsbtn[i].checked) {piece = piece + Number(divbtn[i].value);sum = sum + Number(fontss[i].innerHTML);}}num.innerHTML = piece;main.innerHTML = sum;}//设置高级按钮var add = document.querySelectorAll(".add");var minus = document.querySelectorAll(".minus");for (var i = 0; i < add.length; i++) {add[i].value = i;add[i].onclick = function() {console.log(this.value);console.log(divbtn[this.value]);console.log(i);console.log(divbtn[i]);var x = divbtn[this.value].value;x++;divbtn[this.value].value = x;totalprice()}}for (var i = 0; i < minus.length; i++) {minus[i].value = i;minus[i].onclick = function() {var x = divbtn[this.value].value;if (x < 1) {x = 0} else {x--;divbtn[this.value].value = x;totalprice()}}}</script>
</body></html>运行结果
