1.js: $(‘.car_img_con img‘)[0]; var jsObj = document.getElementsByClassName(‘sel_index_block‘)[0];jsObj.html();TypeError: undefined is not a function
jquery: $(‘.car_img_con img‘); var jqObj = $(‘.sel_index_block‘).eq(0);jqObj.html() "不选预算"
原文：http://www.cnblogs.com/jymz/p/3988090.html