js 中判读字符串包含某个字符

方法1 ：indexOf

  var str = 'objectarray123456'

  console.log(str.indexOf('array')) //6

方法2：search

 var str = 'objectarray123456'

console.log(str.search('123')) //11

方法3: match

var reg = /array/g

 console.log(str.match(reg)) //["array"]

方法4: test

var reg = /array/g

 console.log(reg.test(str)) //true

方法5:

var reg = /array/

console.log(reg.exec(str)) //["array", index: 6, input: "objectarray123456", groups: undefined]