js 字符串

$(function(){
var str="asdfghjkl";
var resul_sub=str.substring(0,4);//截取前四个字符
console.log(resul_sub);//asdf

var str1="a|s|d|f|g|h|j|k|l";
var result_sp=str1.split('|');
console.log(typeof result_sp);
$.each(result_sp,function(n,value) {
console.log(value);//分别输出各个元素
});

//将数组转换为字符串
var arr = new Array(3);
arr[0] = "George";
arr[1] = "John";
arr[2] = "Thomas";
console.log(arr.join());//George,John,Thomas

var arr1 = new Array(3)
arr1[0] = "George"
arr1[1] = "John"
arr1[2] = "Thomas"
console.log(arr1.join("-"));//George-John-Thomas

var resul_if=str.indexOf("s");//根据字符返回下标
console.log(resul_if);//1

var resul_ch=str.charAt(2);//根据下标返回字符
console.log(resul_ch);//d
})