正文
JavaScript prototype应用
小程序：扫一扫查出行【扫一扫了解最新限行尾号】
复制小程序
- //JavaScript自定义功能
- //1,去除字符串两端空格
- String.prototype.trim = function()
- {
- var start, end;
- start = 0;
- end = this.length - 1;
- while(start <= end && this.charAt(start)==' ')
- {
- start++;
- }
- while(start <= end && this.charAt(end) == ' ')
- {
- end--;
- }
- return this.substing(start,end+1);
- }
- //2,将字符串转成数组
- String.prototype.toCharArray = function()
- {
- var chs = [];
- for(var x = 0; x < this.length; x++)
- {
- chs[x] = this.charAt(x);
- }
- return chs;
- }
- //3,字符串进行反转
- String.prototype.reverse = function()
- {
- var arr = this.toCharArray();
- function swap(arr,a,b)
- {
- var temp = arr[a];
- arr[a] = arr[b];
- arr[b] = temp;
- }
- for(var x = 0, y = arr.length - 1; x < y; x++, y--)
- {
- swap(arr,x,y);
- }
- return arr.join("");
- }
