问题产生:
function createButton() {
var obj = document.createElement("button");
obj.innerHTML = "click me";
obj.onclick = function() {
//handle onclick
}
obj.onmouseover = function() {
//handle onmouseover
}
return obj;//return a object which has memory leak problem in IE6
}
var dButton = document.getElementById("d1").appendChild(createButton());
//skipped
.
var obj = document.createElement("button");
obj.innerHTML = "click me";
obj.onclick = function() {
//handle onclick
}
obj.onmouseover = function() {
//handle onmouseover
}
return obj;//return a object which has memory leak problem in IE6
}
var dButton = document.getElementById("d1").appendChild(createButton());
//skipped
![](/images/dot.gif)
对于 IE6 中,引起内存泄露的原因,可看《Understanding and Solving Internet Explorer Leak Patterns》一文。
上面的例子,应该属于上文中的 “Closures”原因。
解决方案:
/**
* Use the try
finally statement to resolve the memory leak issue
*/
function createButton() {
var obj = document.createElement("button");
obj.innerHTML = "click me";
obj.onclick = function() {
//handle onclick
}
obj.onmouseover = function() {
//handle onmouseover
}
//this helps to fix the memory leak issue
try {
return obj;
} finally {
obj = null;
}
}
var dButton = document.getElementById("d1").appendChild(createButton());
//skipped
.
* Use the try
![](/images/dot.gif)
*/
function createButton() {
var obj = document.createElement("button");
obj.innerHTML = "click me";
obj.onclick = function() {
//handle onclick
}
obj.onmouseover = function() {
//handle onmouseover
}
//this helps to fix the memory leak issue
try {
return obj;
} finally {
obj = null;
}
}
var dButton = document.getElementById("d1").appendChild(createButton());
//skipped
![](/images/dot.gif)