Detailed explanation of different usage codes of for loop statements in javascript

Loop statements are often used in program implementation, among which the for loop is found in most languages. In JavaScript, there are several different uses of for loops. Here are my understandings of each.

The first type: (Normally, perform related operations in a loop)

var objA=document.getElementsByTagName("a"); 
var i,max; 
for(i=0,max=objA.length;i<max;i++){ 
objA[i].onclick=function(){ 
alert(this.innerHTML); 
} 
}

Loop, register the click operation of the hyperlink label in sequence

The second type: (for objects, operating object content)

var person={name:'wmhello',age:'28'}; 
var tips=''; for(var obj in person){ 
tips+=obj+'-->'+person[obj]+'\n' 
} 
alert(tips)

The third type: (often used for arrays, performing specific operations on arrays)

var num=[1,3,5]; 
var total=0; 
num.forEach(function(e){ 
total+=e; 
}); 
alert(total);

This forEach loop works in firefox and chrome

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