字符串转换
toString()
String()
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将字符串分割成数组
var str = 'a,string'
var arr = str.split(',') //将字符分割成数组
console.log(arr) //结果[ 'a','string' ]
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删除字符串中特定字符
var str = 'abc'
var msg = str.replace('a','')
console.log(msg) //结果‘bc’
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截取字符串
var str = 'abcd'
var substr = str.substring(0,2) // 结果 'abc'
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获取文件扩展名
var txt = 'abc.jpg'
var suff = txt.substr(txt.lastIndexOf('.'))
console.log(suff) // 结果 '.jpg'
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拼接两个数组
var arr1 = [ '1' , '2' ]
var arr2 = [ '3' , '4' ]
arr1.push.apply(arr1,arr2)
console.log(arr1) // 结果 [ '1' , '2' , '3' , '4' ]
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将数组对象转换成JSON字符串
JSON.stringify(arr)
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添加数组
unshift( ) // 前面添加
push( ) // 后面添加
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删除数组中一项或多项
splice(1,1)
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循环数组
forEach()