前端常用方法

 watch: {
    'bindForm.name'(val) {
      let pattern = /[^\u4e00-\u9fa5]+/
      this.bindForm.name = val.replace(pattern, '')
      if (val.length > 32) {
        this.bindForm.name = val.substring(0, 32)
      }
      this.checkIsComplete()
    },
    'bindForm.phone'(val) {
      if (val.length > 11) {
        this.bindForm.phone = val.substring(0, 11)
      }
      this.checkIsComplete()
    },
    'bindForm.code'(val) {
      if (val.length > 6) {
        this.bindForm.code = val.substring(0, 6)
      }
      this.checkIsComplete()
    },
  }

function getQueryString(name) {
    var reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)', 'i')
    var reg_rewrite = new RegExp('(^|/)' + name + '/([^/]*)(/|$)', 'i')
    var r = window.location.search.substr(1).match(reg)
    var q = window.location.pathname.substr(1).match(reg_rewrite)
    if (r != null) {
       return unescape(r[2])
    } else if (q != null) {
       return unescape(q[2])
    } else {
       return null
    }
 }

var obj1 = {};
console.log( Object.getPrototypeOf( obj1 ) === Object.prototype ); // 输出:true

var obj = {
  myName: 'sven',
  getName: function(){ 
      return this.myName;
  } 
};

console.log( obj.getName() ); // 'sven'
var getName2 = obj.getName; 
console.log( getName2() );   // undefined

var MyClass = function(){
  this.name = 'sven';
  return { // 显式地返回一个对象
    name: 'anne'
  }
}

var obj = new MyClass();
alert ( obj.name ); // 输出:anne

document.getElementById('div1').onclick = function(){
  alert(this.id);  // this指向div，输出：div1
  var func = function(){
    alert(this.id);   // this指向window，输出：undefined
  }
  func();
}

Math.max.apply( null, [ 1, 2, 5, 3, 4 ] ) // 输出:5

var Type = {};
for(var i = 0, type; type = ['String', 'Array', 'Number'][i++];){
  (function(type){
    Type['is' + type] = function(obj){
      return Object.prototype.toString.call(obj) === '[object ' + type + ']';
    }
  })(type);
}

Type.isArray([]);
Type.isString('str');

(function(){
  Array.protorype.push.call(argument, 4);  // argments借用Array.protorype.push方法
  console.log(argments);  // 输出：[1, 2, 3, 4]
})(1, 2, 3)

var throttle = function(fn, interval){
  var _self = fn,  // 保存需要被延迟执行的函数引用
      timer,       // 定时器
      firstTime = true;   // 是否是第一次调用
           
  return function() {
    var args = arguments,
        _me = this;
        
    if(firstTime) {
       _self.apply(_me, args);
       return firstTime = false;
    }
    
    if(timer) {   // 如果定时器还在，说明前一次延迟执行还没有完成
      return false;
    }
    
    timer = setTimeout(function() {
      clearTimeout(timer);
      timer = null;
      _self.apply(_me, args);
    }, interval || 500);
  }
}


// 使用
window.onresize = throttle(function() {
  console.log(1);
}, 500)

function flatten(){
    var ret=[];
    return function flat(a){
        for(var item of a){
            if(item.constructor===Array){
                ret.concat(flat(item))
            }else{
                ret.push(item)
            }
        }
        return ret
    }
}

arr.toString().split(",").map(Number)

// ES6
arr.flat(dep)