Html的JavaScript代碼，檢查重複的ID

Question

如何檢查在JavaScript中包含重複id的標籤？

Answer 1

試試這個：

var nodes = document.querySelectorAll('[id]'); 
var ids = {}; 
var totalNodes = nodes.length; 

for(var i=0; i<totalNodes; i++) { 
    var currentId = nodes[i].id ? nodes[i].id : "undefined"; 
    if(isNaN(ids[currentId])) { 
     ids[currentId] = 0; 
    }     
    ids[currentId]++; 
} 

console.log(ids); 

http://jsfiddle.net/sekVp/1