javascript 中forEach，for in循环的用法

let array = [‘a‘,‘b‘,‘c‘];
for (let i = 0;i < array.length;i++){
  console.log(array1[i]);  // a  b  c 
}

 for(let index in array) {  
        console.log(index,array[index]);  
    };  

array.forEach(v=>{  
    console.log(v);  
});
array.forEach（function(v){  
    console.log(v);  
});

 valueList.forEach(element => {
            console.log(element + " is exist in the list");
            let label = this.filterLabel.replace(/\{0\}/g, element);
            let result = $(label).isDisplayed();
            expect(result).to.equal(false);
        });