function a(){ //切换灯的状态 timer = setInterval( function(){ index++; aLi[0].className = "s" + index; oCount.innerHTML = 3; //每次换灯的时候,从3开始 b(); if( index == 4 ){ index = 1; } }, 2000 ); } //等待时间 function b(){ clearInterval( timer ); //关闭红绿灯的切换状态,进入时间等待状态 timer = setInterval( function(){ var count = parseInt(oCount.innerHTML); count--; oCount.innerHTML = count; if ( count == 0 ) {//停止时间切换,进入红绿灯切换 clearInterval( timer ); a(); //切换灯 } }, 1000 ); } a(); }
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