stringletstr='abdefgh';console.log(str.indexOf('d')>-1);//trueconsole.log(str.search('d')>-1);//trueconsole.log(/d/.test(str));//真实对象letobj={age:20};console.log(obj.age)//20console.log(obj.hasOwnProperty('age'));//真正的数组letarr=['a','b','c','d'];console.log(arr.indexOf('d')>-1);//trueconsole.log(arr.includes('d'));//true文章内容/灵感借鉴自以下内容【持续维护/更新500+前端面试题/笔记】https://github.com/noxussj/In...【大数据可视化图表插件]https://www.npmjs.com/package...[使用THREE.JS实现3D城市建模（珠海市）]https://3d.noxussj.top/
