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                信號量等同于累加器 放到函數外面 xinhaoliang=0; function(){ 點擊一次 xinhaoliang++; 累加一次 } 案例: ``` <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> *{ padding: 0; margin: 0; } li{ list-style: none; } .lunbotu{ width:658px; height:206px; border:2px solid red; margin:100px auto; position:relative; } .lunbotu .anniu ul li{ width:50px; height:25px; background-color: rgb(241, 241, 28); position:absolute; top:50%; margin-top:-12.5px; text-align: center; line-height:25px; display:block; cursor:pointer; } .lunbotu .anniu ul li.you{ right:0; } </style> </head> <body> <div class="lunbotu"> <a href="#"><img src="./img/1.jpg" alt="" id="tu"></a> <div class="anniu"> <ul> <li id="box">左</li> <li class="you" id="box1">右</li> </ul> </div> </div> </body> </html> <script type="text/javascript"> //獲取點按鈕 var you=document.getElementById("box1"); //獲取圖片 var tu=document.getElementById("tu"); //按鈕綁定單機事件 var xinhao=1; //信號量 you.onclick=function(){ xinhao++; if(xinhao>2){xinhao=1}; tu.src="./img/"+xinhao+".jpg"; } var zuo=document.getElementById("box"); zuo.onclick=function(){ if(xinhao>1){ xinhao--; tu.src="./img/"+xinhao+".jpg"; } } </script> ```
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