JS 常用方法

function repeatCount(str) {
    return str.split('').reduce((p, k) => (p[k]++ || (p[k] = 1), p), {});
}

var str = 'abcdaabc';
var info = repeatCount(str);
console.log(info); //{ a: 3, b: 2, c: 2, d: 1 }

function stopBubble(e){
    if (e && e.stopPropagation)
        e.stopPropagation()
    else
        window.event.cancelBubble=true
}

// 初步封装
function log(){
  console.log.apply(console,arguments)
}
// 第二次封装，怎么才能在参数前面加前缀
function log(){
  var newArguments = []
  if(arguments.length > 0){
    for(var i = 0; i < arguments.length; i++){
      newArguments.push('prefix',arguments[i])
    }
  }
  console.log.apply(console,newArguments)
}

function deletMany(arr){
  var obj = {}
  var newArr = []
  for(var i=0; i
 

  
   金额格式化
  

  
function toThousands(num) {
    var potStr = '.00'
    num = (num||0).toString()
    if(num.indexOf('.') !== -1){
       potStr = num.substr(num.indexOf('.'),3)
    }

    var result = [ ], counter = 0;
    num = num.substring(0,num.indexOf('.')).split('');
    for (var i = num.length - 1; i >= 0; i--) {
        counter++;
        result.unshift(num[i]);
        if (!(counter % 3) && i != 0) { result.unshift(','); }
    }
    return result.join('')+potStr;
}