<script>
$(resetFields);        //相当于addLoadEvent(resetFields);会弹出1111
function resetFields(){
　　alert(111);
}
</script>

<script>
$(resetFields);
function resetFields(){
    $(‘form input[placeholder]‘).focus(function(){
        var input = $(this);
        if(input.val() == input.attr(‘placeholder‘)){
            input.val(‘ ‘);
        }
    }).blur(function(){
        var input = $(this);
        if(input.val() ==‘‘){
            var placeholder = input.attr(‘placeholder‘);
            input.val(placeholder);
        }
    }).blur();
}
</script>