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==在js中是判断相等而===在js是判断完全相等， 





<script type="text/网页特效">
var y = 5;
if(y == "5"){
document.write("== "5" true
");
}
else{
document.write("== "5" false
");
}
if(y == 5){
document.write("== 5 数字 is true
");
}
else{
document.write("== 5 数字 false
");
}
if( y === 5){
document.write("=== 数字5 is true
");
}
else{
document.write("=== 数字5 false
");
}
if(y === "5"){
document.write("=== 5 is true
");
}
else{
document.write("=== 5 is false
");
}
</script>

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