常见的遍历数组和对象的方法

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var list = [1,2,3,4,5];
for (var i = 0; i < list.length; i ++) {
console.log(list[i]);
// 1 2 3 4 5
}

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let arr = [1,2,3];
arr.forEach(function(i,index){
console.log(i,index)
// 1 0
2 1
3 2
})

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var arr = [1,2,3,4,5];
for(var item of arr){
console.log(item);
//1 2 3 4 5
}

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var person = {name: 'kreme', age: 22, sex: 'man', hobby: 'running'};
for(key in person){
console.log(key,':',person[key]);
}
//输出为：name: 'kreme', age: 22, sex: 'man', hobby: 'running'

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var arr = [1,2,3,4,5];
arr.map(function (item) {
console.log(item);
// 1 2 3 4 5
}

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var arr = [1,2,3,4,5];
arr.every(function (item) {
console.log(item);
// 1 2 3 4 5
}

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var arr = [1,2,3,4,5];
arr.some(function (item) {
console.log(item);
// 1 2 3 4 5
}

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var arr = [1,2,3,4,5];
arr.filter(function (item) {
console.log(item);
// 1 2 3 4 5
}

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var arr = [1,2,3,4,5];
arr.foreach(function (item) {
console.log(item);
// 1 2 3 4 5
}