For循环的演变 For循环的演变

【For循环的演变】For循环,For In,For each,$Angular.forEach,$.grep

1. For循环

for(var i=0; i<10; i++){ console.log(i); }

2.For in

var list=[{name:'test1'},{name:'test2'}]; for(var m in list){ console.log(m)}

3.For each

var database = {users: ["CSSer", "John", "David"], sendEmail: function (user) { if (this.isValidUser(user)) { console.log("test"); }}, isValidUser: function (user) { console.log("test1"); return true; }}; // 向每个用户发送邮件 database.users.forEach(database.sendEmail,database);

4.Angular.forEach ,Angular $.grep

$scope.userList=[{name:'t1',age:10},{name:'t1',age:10},{name:'t1',age:10}]; $scope.oldUserList=[{name:'t1',age:10},{name:'t1',age:10},{name:'t1',age:10}]; angular.forEach($scope.userList,function(user){ //user是前面的迭代对象 var tempIndex; $.grep($scope.oldUserList,function(oldUser,index){ if(oldUser.id==user.id){ tempIndex=index; $scope.oldUserList.splice(tempindex,1); } }); });