js 获取指定字符串个数

参考：https://blog.csdn.net/maqinqin/article/details/5323824

function getStrCount(scrstr,armstr) { //scrstr 源字符串 armstr 特殊字符
     var count=0;
     while(scrstr.indexOf(armstr) != -1 ) {
        scrstr = scrstr.replace(armstr,"")
        count++;    
     }
     return count;
}