報錯說slideEl is not defined 但是：var slider = this.$slider, sliderEl = slider[0]; console.log(sliderEl);
結果：<div class="scroll-slider"></div> log里有scroll-slider 啊。但還是報錯:246 Uncaught ReferenceError: slideEl is not defined
為什么啊，這樣if(slideEl){}中的運行不了啊
